Author: "Judith Monnier" / Topic: 021001 nanoscience & nanotechnology - Searchworks@Jio Institute Digital Library Search Results

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1. Experimental and Theoretical Investigations on the Influence of A on the Hydrogen Sorption Properties of ANiy Compounds, A = {Y, Sm, Gd}

Author: Nicolas Madern, Junxian Zhang, Michel Latroche, Jean-Claude Crivello, Judith Monnier, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Hydrogen sorption, Materials science, Phase stability, Thermodynamics, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, Electronic structure, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Stability (probability), Standard enthalpy of formation, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, General Energy, Density functional theory, Physical and Theoretical Chemistry, Single phase, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract: The phase stability, electronic structure, magnetic and mechanical properties of ANiy compounds, A = {Y, Sm, Gd}, y = {2, 3, 72, 195, 4, 5}, and A2Ni7H8 hydrides have been investigated by systematic first-principles calculations. Supported by a discussion to understand the role of A and y parameters, the results are compared with published and new experimental data regarding the heat of formation of some compounds and their hydrides. The main results can be summarized as follows: (i) ANi3 and A2Ni7 are clearly stable by the density functional theory calculation, whereas the stability of ANiy for y>72 is not highlighted distinctively, in agreement with the difficulty to identify a single phase by experimental synthesis for some compounds such as Y5Ni19; (ii) ANiy compounds are found more rigid for A = Y and may explained the difficulty to observe Y5Ni19 in comparison with Sm5Ni19 and Gd5Ni19; and (iii) the calculated and measured heats of formation of A2Ni7H8 hydrides are found in good agreement, around −2...
Published: 2019
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2. Oxidation Behavior of the Skutterudite Material Yb0.2Co4Sb12

Author: Judith Monnier, Philippe Masschelein, Lionel Aranda, Patrice Berthod, Anne Dauscher, Nicolas David, Christophe Candolfi, Bertrand Lenoir, M. Benyahia, Richard Drevet, Driss Kenfaui, Eric Alleno, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Ytterbium, Materials science, Oxide, chemistry.chemical_element, 02 engineering and technology, engineering.material, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 01 natural sciences, Redox, chemistry.chemical_compound, 0103 physical sciences, Thermoelectric effect, Oxidizing agent, Skutterudite, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Spinel, Metallurgy, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, chemistry, Chemical engineering, 13. Climate action, Mechanics of Materials, engineering, Degradation (geology), 0210 nano-technology
Abstract: The skutterudite materials belonging to the CoSb3 family are widely studied for thermoelectric applications. They are typically used under vacuum, but applications under oxidizing environments are increasingly considered. The addition of ytterbium is known to enhance the thermoelectric properties of CoSb3, but the corresponding impact on the oxidation behavior of the skutterudite material is barely explored. For that purpose, the present research describes the oxidation behavior of Yb0.2Co4Sb12 under a flow of air at 800 K for 15, 50, 100, and 1000 hours. The oxidation treatment induces the growth of a surface layer made of three oxides in various amounts as a function of the oxidation time. The spinel oxide CoSb2O4/CoO·Sb2O3 and CoSb2O6 are observed from 15 hours of oxidation, whereas Sb2O4 is formed only from 100 hours of treatment. To assess the impact of ytterbium, the oxidation behavior of Yb0.2Co4Sb12 is compared to that of CoSb3 oxidized in the same experimental conditions. The results show that the low amount of ytterbium promotes the oxidation reactions of the skutterudite material. Nonetheless, the impact on the degradation of the material remains acceptable to use Yb0.2Co4Sb12 for thermoelectric applications under oxidizing environments.
Published: 2021
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3. Improvement of reversible H storage capacity by fine tuning of the composition in the pseudo-binary systems A2-xLaxNi7 (A = Gd, Sm, Y, Mg)

Author: Judith Monnier, Véronique Charbonnier, Michel Latroche, Junxian Zhang, Nicolas Madern, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and National Institute of Advanced Industrial Science and Technology (AIST)
Subjects: crystal structure, Materials science, Hydrogen, chemistry.chemical_element, FOS: Physical sciences, 02 engineering and technology, Crystal structure, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Hydrogen storage, Transition metal, Materials Chemistry, Alkaline earth metal, Condensed Matter - Materials Science, Rietveld refinement, Mechanical Engineering, Metals and Alloys, Materials Science (cond-mat.mtrl-sci), Sorption, Yttrium, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, thermodynamic tuning, Mechanics of Materials, Physical chemistry, 0210 nano-technology
Abstract: International audience; A2B7 compounds (A = rare earth or Mg, B = transition metal) are widely studied as active materials for negative electrode in Ni-MH batteries. By playing on the substitution rate of both A and B elements, it is possible to prepare various compositions. This strategy will help to improve the properties, for example get a higher reversible hydrogen capacity and a well-adapted hydrogen sorption pressure. Indeed, A can be almost all light rare earths (La to Gd), yttrium and alkaline earth metals (Mg or Ca), whereas B can contain various late transition metals (Mn to Ni). To understand the effects of composition on the physicochemical properties of La2Ni7-based compound, various pseudo-binary systems have been investigated: Gd2-xLaxNi7 (x = 0, 0.6, 1, 1.5), Sm2-xLaxNi7 (x = 0, 0.5, 1, 1.5), Y2-xLaxNi7 (x = 0, 0.4, 0.5, 0.6, 0.8, 1, 1.5, 1.75) and A0.5La1.1Mg0.4Ni7 (A = Sm, Gd and Y). To determine their crystallographic properties, X-ray diffraction analysis was performed followed by Rietveld refinement. Thermodynamic properties regarding reversible hydrogen sorption were investigated at room temperature. Quaternary compounds present drastically improved sorption properties in the frame of practical energy storage applications with reversible capacity equivalent to 400 mAh/g for the compound La1.1Sm0.5Mg0.4Ni7.
Published: 2021
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4. Chemical architecturation of high entropy alloys through powder metallurgy

Author: Judith Monnier, Glwadys Garcin, Benjamin Villeroy, Mathilde Laurent-Brocq, Diaa Mereib, Loïc Perrière, Institut de Chimie et des Matériaux Paris-Est (ICMPE), and Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Alloy, Energy-dispersive X-ray spectroscopy, Spark plasma sintering, 02 engineering and technology, engineering.material, mechanical properties, 010402 general chemistry, 01 natural sciences, Condensed Matter::Materials Science, Powder metallurgy, Materials Chemistry, Composite material, Mechanical Engineering, High entropy alloys, Metals and alloys, [CHIM.MATE]Chemical Sciences/Material chemistry, Nanoindentation, 021001 nanoscience & nanotechnology, Microstructure, 0104 chemical sciences, X-ray diffraction, powder metallurgy, Mechanics of Materials, SEM, engineering, Grain boundary, 0210 nano-technology, scanning electron microscopy
Abstract: International audience; The chemically architectured alloys were proposed as a new concept of microstructure, with a multiscale architecturation. They are composed of a solid-solution at the atomic scale, grain boundaries and composition gradients at the micronic scale and finally a 3D network of gradients at the mesoscale. Composition gradients are between two phases with the same crystalline structure but different compositions. As a first application of this concept, powders of pure Ni and CoCrFeMnNi high entropy alloy were successfully densified by Spark Plasma Sintering. Then the microstructure and mechanical properties were characterized by scanning electron microscope coupled with energy dispersive spectroscopy and electron backscattered diffraction, X-ray diffraction, nanoindentation and compression tests. The obtained chemically architectured alloys present a homogeneous distribution of the two phases with a 10 µm wide chemical gradient in between. By comparison with reference non architectured materials, the chemical architecturation induces a 35 % increase of the yield strength. Thus the concept of chemically architectured metallic alloys and composition gradients was proven as very promising: processing of this complex microstructure is possible and it induces a significant mechanical strengthening.
Published: 2020
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5. Investigation of H Sorption and Corrosion Properties of Sm2MnxNi7−x (0 ≤ x < 0.5) Intermetallic Compounds Forming Reversible Hydrides

Author: Valérie Paul-Boncour, Nicolas Madern, Junxian Zhang, Michel Latroche, Véronique Charbonnier, Judith Monnier, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and National Institute of Advanced Industrial Science and Technology (AIST)
Subjects: Control and Optimization, Materials science, Galvanic anode, Inorganic chemistry, Intermetallic, metallic hydrides, Energy Engineering and Power Technology, chemistry.chemical_element, Binary compound, 02 engineering and technology, 010402 general chemistry, 7. Clean energy, 01 natural sciences, lcsh:Technology, Corrosion, chemistry.chemical_compound, Hydrogen storage, magnetic measurements, Electrical and Electronic Engineering, Engineering (miscellaneous), Condensed Matter - Materials Science, rare earths, corrosion, Renewable Energy, Sustainability and the Environment, Nanoporous, lcsh:T, Ni-MH batteries, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Nickel, chemistry, Hydroxide, 0210 nano-technology, Energy (miscellaneous)
Abstract: Intermetallic compounds are key materials for energy transition as they form reversible hydrides that can be used for solid state hydrogen storage or as anodes in batteries. ABy compounds (A = Rare Earth (RE); B = transition metal; 2 < y < 5) are good candidates to fulfill the required properties for practical applications. They can be described as stacking of AB5 and AB2 sub-units along the c crystallographic axis. The latter sub-unit brings a larger capacity, while the former one provides a better cycling stability. However, ABy binaries do not show good enough properties for applications. Upon hydrogenation, they exhibit multiplateau behavior and poor reversibility, attributed to H induced amorphization. These drawbacks can be overcome by chemical substitutions on the A and/or the B sites leading to stabilized reversible hydrides. The present work focuses on the pseudo-binary Sm2MnxNi7-x system (0 0.3 leading to larger and flatter isotherm curves, allowing for reversible capacity >1.4 wt %. Regarding corrosion, the binary compound corrodes in alkaline medium to form rare earth hydroxide and nanoporous nickel. As for the Mn-substituted compounds, a new corrosion product is formed in addition to those above mentioned, as manganese initiates a sacrificial anode mechanism taking place at the early corrosion stage., Comment: Special Issue : Hydrogen Storage Properties of Materials
Published: 2020
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6. The influence of preparation conditions on the electrical transport properties of tetrahedrites

Author: Bertrand Lenoir, Gonçalo Domingos, Elsa B. Lopes, Judith Monnier, and António Pereira Gonçalves
Subjects: 010302 applied physics, Diffraction, Materials science, Tetrahedrite, Analytical chemistry, Spark plasma sintering, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, Magazine, Electrical resistivity and conductivity, law, Seebeck coefficient, 0103 physical sciences, Thermoelectric effect, engineering, Melt spinning, 0210 nano-technology
Abstract: Materials with Cu12-xNixSb4-yBiyS13-zSez (0 ≤ x ≤ 1, 0 ≤ y ≤ 0.4, 0 ≤ z ≤ 3) compositions were prepared by melting the elements under vacuum. All samples were studied in the as-cast form, and parts of them were characterized after either a spark plasma sintering or a melt spinning/glass-crystallization procedure. Powder X-ray diffraction shows that all materials are mainly constituted by tetrahedrite, except in the case of the Cu12Sb4S10Se3 composition treated by SPS that is constituted by skinnerite, famatinite and tetrahedrite. Electrical conductivity and Seebeck coefficient measurements point to a large effect of the preparation technique and experimental conditions on the electrical transport properties. The as-cast samples have low Seebeck coefficients (α300K ≤ 35 μV/K), and are not suitable for thermoelectric applications. The spark plasma sintering procedure did not significantly change the Seebeck coefficient values and can degrade the electrical conductivity, particularly if skinnerite and famatinite are formed. Materials treated by melt spinning/glass-crystallization show higher Seebeck coefficients and often lower electrical resistivity when compared with the as-cast samples, indicating this method as a suitable technique for quick preparation of good thermoelectric tetrahedrites
Published: 2019
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7. Importance of the synthesis and sintering methods on the properties of manganite ceramics: The example of La 0.7 Ca 0.3 MnO 3

Author: Y. Regaieg, L. Sicard, F. Ayadi, Mohamed Koubaa, Souad Ammar, W. Cheikhrouhou-Koubaa, Judith Monnier, and Sophie Nowak
Subjects: 010302 applied physics, Materials science, Mechanical Engineering, Transition temperature, Metals and Alloys, Spark plasma sintering, Sintering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Manganite, 01 natural sciences, Grain size, Chemical engineering, Mechanics of Materials, visual_art, 0103 physical sciences, Materials Chemistry, visual_art.visual_art_medium, Magnetic refrigeration, Ceramic, 0210 nano-technology, Stoichiometry
Abstract: The influence of the synthesis and sintering methods on the structural, microstructural, stoichiometry and thus the magnetocaloric properties of the La0.7Ca0.3MnO3 compound has been thoroughly studied. Soft-chemistry (sol-gel and polyol) synthesis and spark plasma sintering (SPS) procedures, used to obtain nanostructured materials, were compared to the traditional ceramic ones. This work evidences that SPS treatment not only reduces the grain size but also leads to oxygen sub-stoichiometry. This entails a lower Mn4+ content in the manganite, and probably heterogeneity in the Mn4+ grain distribution, which have consequences on the magnetic and magnetocaloric properties: a lower maximum entropy variation which is compensated by a larger transition temperature range. The sample prepared by combining polyol soft-chemistry synthesis and SPS sintering displays a higher maximum relative cooling power value, equal to 70% of that of gadolinium, the most effective material for domestic magnetic refrigeration.
Published: 2018
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8. Characterization of refractory steel oxidation at high temperature

Author: Jean-Marc Joubert, Rita Baddour-Hadjean, Antonin Steckmeyer, Judith Monnier, Nicolas Madern, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Chimie métallurgique des terres rares (CMTR), Centre National de la Recherche Scientifique (CNRS), and Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, General Chemical Engineering, Oxide, chemistry.chemical_element, 02 engineering and technology, Manganese, engineering.material, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Corrosion, chemistry.chemical_compound, 0103 physical sciences, [CHIM]Chemical Sciences, General Materials Science, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Austenite, Spinel, technology, industry, and agriculture, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, 021001 nanoscience & nanotechnology, Microstructure, Chromia, chemistry, Chemical engineering, engineering, Chromite, 0210 nano-technology
Abstract: The high temperature oxidation behavior of two highly alloyed refractory austenitic steels is studied at 1000 °C under air. Both short-term oxidation kinetics and long-term oxidation products are investigated. Structural, elemental and morphological analyses are coupled to characterize the oxide phases’ formation. Chromia and spinel are the main phases for both samples although they suffer important descaling after 4 weeks oxidation, but alloying elements are responsible for the formation of many other oxides. Microstructures are compared and discussed. New Raman spectra are reported for manganese chromite spinels. Their assignments are provided and discussed at the light of the proposed cationic distribution.
Published: 2018
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9. Oxidation Studies of Cu12Sb3.9Bi0.1S10Se3 Tetrahedrite

Author: Maria de Fátima Montemor, Judith Monnier, Bertrand Lenoir, Elsa B. Lopes, and António Pereira Gonçalves
Subjects: 010302 applied physics, Materials science, Tetrahedrite, Doping, Analytical chemistry, 02 engineering and technology, Electrolyte, engineering.material, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, 01 natural sciences, Electronic, Optical and Magnetic Materials, Corrosion, 0103 physical sciences, Thermoelectric effect, Materials Chemistry, engineering, Thermal stability, Surface layer, Electrical and Electronic Engineering, 0210 nano-technology
Abstract: Tetrahedrites are widespread minerals with general formula Cu10M2Sb4S13 (M = Cu, Mn, Fe, Co, Ni, Zn). Their thermoelectric properties can be tuned through proper doping and reach zT values as high as 1, being considered promising low-cost thermoelectric materials. However, for practical application in thermoelectric devices, it is necessary to establish their ability to operate for long periods under working temperatures and atmospheres. We present herein studies of oxidation in air of Cu12Sb3.9Bi0.1S10Se3 tetrahedrite at four different temperatures between 230°C and 375°C, together with preliminary corrosion studies in aggressive NaCl electrolyte. Surface oxidation already occurs at the lower studied temperatures, but a strong decrease of the oxidation rate is observed for materials treated at intermediate temperature (275°C), where a continuous surface layer of Cu2−xS forms, pointing to a protective effect of this layer that could be applied in devices operating at such temperatures. For the material treated at higher temperatures (350°C and 375°C), no tetrahedrite phases were seen after 1500 h, which can be related to the (tetrahedrite + chalcostibite + antimony → skinnerite) reaction that occurs above 280°C. Corrosion studies indicated that increasing the oxidation temperature unfortunately leads to a decrease of the corrosion resistance of tetrahedrite-based phases.
Published: 2018
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10. Anisotropic Nanoporous Nickel Obtained through the Chemical Dealloying of Y 2 Ni 7 for the Comprehension of Anode Surface Chemistry of Ni‐ M H Batteries

Author: Christine Cachet-Vivier, Valérie Paul-Boncour, Judith Monnier, Junxian Zhang, Nicolas Madern, Stéphane Bastide, Michel Latroche, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Chemistry, Nanoporous, Intermetallic, chemistry.chemical_element, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, Catalysis, 0104 chemical sciences, Corrosion, Anode, Nickel, Chemical engineering, 0210 nano-technology, Anisotropy, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2019
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11. Correlations between stacked structures and weak itinerant magnetic properties of La$_{2-x}$ Y$_x $ Ni$_7$ compounds

Author: Véronique Charbonnier, Junxian Zhang, Michel Latroche, Valérie Paul-Boncour, Jean-Claude Crivello, Nicolas Madern, Judith Monnier, Léopold V B Diop, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Energy Process Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Intermetallics, Magnetism, Intermetallic, FOS: Physical sciences, 02 engineering and technology, Crystal structure, 01 natural sciences, 0103 physical sciences, [CHIM.CRIS]Chemical Sciences/Cristallography, Antiferromagnetism, General Materials Science, Weak Itinerant Magnetism, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, Metamagnetism, Condensed Matter - Materials Science, Spin polarization, Materials Science (cond-mat.mtrl-sci), [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 3. Good health, Crystallography, X-ray crystallography, Crystal Structure, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, First principles calculations, Powder diffraction
Abstract: Hexagonal La$_2$Ni$_7$ and rhombohedral Y$_2$Ni$_7$ are weak itinerant antiferromagnet (wAFM) and ferromagnet (wFM), respectively. The crystal structure and magnetic properties of $A_2B_7$ intermetallic compounds ($A$ = La, Y, $B$ = Ni) have been investigated combining X-ray powder diffraction and magnetic measurements. The La$_{2-x}$Y$_x$Ni$_7$ intermetallic compounds with $0 \leq x \leq 1$ crystallize in the Ce$_{2}$Ni$_7$-type hexagonal structure with Y preferentially located in the [$AB_2$] units. The compounds with larger Y content ($1.2 \leq x < 2$) crystallize in both hexagonal and rhombohedral (Gd$_2$Co$_7$-type) structures with a progressive substitution of Y for La in the $A$ sites belonging to the [$AB_5$] units. Y$_2$Ni$_7$ crystallizes in the rhombohedral structure only. The average cell volume decreases linearly versus Y content, whereas the c/a ratio presents a minimum at $x = 1$ due to geometric constrains. The magnetic properties are strongly dependent on the structure type and the Y content. La$_{2}$Ni$_7$ displays a complex metamagnetic behavior with split AFM peaks. Compounds with x = 0.25 and 0.5 display a wAFM ground state and two metamagnetic transitions, the first one towards an intermediate wAFM state and the second one towards a FM state.T$_N$ and the second critical field increase with the Y content, indicating a stabilization of the AFM state. LaYNi$_7$, which is as the boundary between the two structure types, presents a very wFM state at low field and an AFM state as the applied field increases. All the compounds with $x > 1$ and containing a rhombohedral phase are wFM with $T_C$ = 53(2) K. In addition to the experimental studies, first principles calculations using spin polarization have been performed to interpret the evolution of both structural phase stability and magnetic ordering for $0 \leq x < 2$., 26 pages (7 for supplementary material), 4 tables, 9 main figures and 8 figures in supplementary material
Published: 2019
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12. Magnetocaloric nanostructured La0.7Ca0.3−xBaxMnO3 (x < 0.3) ceramics produced by combining polyol process and Spark Plasma Sintering

Author: F. Ayadi, Judith Monnier, A. Cheikhrouhou, Sophie Nowak, L. Sicard, Souad Ammar, W. Cheikhrouhou-Koubaa, S. Reguer, and Thomas Gaudisson
Subjects: 010302 applied physics, Materials science, Mechanical Engineering, Metallurgy, Metals and Alloys, Analytical chemistry, Spark plasma sintering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, XANES, Soft chemistry, Ferromagnetism, Mechanics of Materials, visual_art, 0103 physical sciences, Materials Chemistry, visual_art.visual_art_medium, Magnetic refrigeration, Atomic ratio, Ceramic, 0210 nano-technology
Abstract: Ferromagnetic La0.7Ca0.3−xBaxMnO3 (x
Published: 2017
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13. Tetrahedrites for Low Cost and Sustainable Thermoelectrics

Author: Eric Alleno, Judith Monnier, Bertrand Lenoir, Jean-Baptiste Vaney, Elsa B. Lopes, C. Godart, Maria de Fátima Montemor, and António Pereira Gonçalves
Subjects: 010302 applied physics, Fabrication, Materials science, business.industry, Tetrahedrite, Nanotechnology, 02 engineering and technology, engineering.material, Raw material, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, 01 natural sciences, Environmentally friendly, Atomic and Molecular Physics, and Optics, 0103 physical sciences, Thermoelectric effect, engineering, General Materials Science, 0210 nano-technology, Process engineering, business
Abstract: Sustainable development is the way to ensure the Human progress within the bounds of the ecological possible. In this context thermoelectric systems can play an important role. However, the price of most high-performance thermoelectric devices is high, mainly due to the use of expensive elements, which raised the interest for cheap thermoelectric materials. It is also clear that the production of competitive thermoelectric devices critically depends on other factors, like the manufacturing costs, and that the materials fabrication simplicity, reproducibility, and use of easy scale-up processes will also play a fundamental role.Tetrahedrites, with generic formula Cu10M2Sb4S13 (M = Cu, Mn, Fe, Co, Ni, Zn), are world spread sulfosalt minerals that crystallize in the cubic Cu12Sb4S13-type structure. They are environment friendly materials mainly formed by non-expensive elements. Recently, mineral based and synthetic tetrahedrites were considered as promising thermoelectric materials, with zT ~ 1 at T ~ 700 K. Though, tetrahedrite melts incongruently, the preparation of appropriate tetrahedrite samples usually requiring long-term annealing procedures. Here we present a set of systematic studies on the use of tetrahedrites as low-cost and sustainable thermoelectric materials. The raw material prices evaluation, the feasibility of rapid, scalable, cheap tetrahedrite preparation and their long term stability and resistance to oxidation under working conditions are highlighted.
Published: 2016
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14. Fast and scalable preparation of tetrahedrite for thermoelectrics via glass crystallization

Author: Annie Pradel, Gaëlle Delaizir, Julie Bourgon, C. Godart, Elsa B. Lopes, Bertrand Lenoir, Andrea Piarristeguy, Jean-Baptiste Vaney, Manuel F. C. Pereira, António Pereira Gonçalves, Eric Alleno, Judith Monnier, Instituto Superior Técnico Universidade de Lisboa (C2TN), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Centro de Recursos Naturais e Ambiente (CERENA), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Projet ANR, ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Glass ceramics, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, law.invention, Bismuth, Antimony, Thermoelectric manufacturing, law, Seebeck coefficient, Materials Chemistry, Crystallization, Waste heat recovery, Mechanical Engineering, Tetrahedrite, Metallurgy, Metals and Alloys, Low-cost thermoelectric materials, 021001 nanoscience & nanotechnology, Thermoelectric materials, Copper, Tetrahedrites, 0104 chemical sciences, chemistry, Mechanics of Materials, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], engineering, Melt spinning, 0210 nano-technology
Abstract: A Cu 12 Sb 3.6 Bi 0.4 S 10 Se 3 glass was prepared by melt spinning and crystallized by heat treatments at selected temperatures, the total preparation procedure taking less than one day. The sample characterization by powder X-ray diffraction, scanning and transmission electron microscopy complemented with EDS indicate the formation of compact materials, with a tetrahedrite relative weight fraction higher than 90% when treated at temperatures close to the crystallization peaks (∼200° C). Selenium enters the tetrahedrite structure, while bismuth precipitates in submicron and nanosized spherical shape phases depleted in copper and enriched in antimony, sulfur and selenium (when compared with the matrix composition). The characterization of electrical transport properties (electrical resistivity and Seebeck coefficient) indicate a behavior similar to that obtained by other methods on Cu 12 Sb 4 S 13 , with a maximum power factor of ∼400 μW/K 2 m at room temperature.
Published: 2016
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15. Microstructure and mechanical properties of a CoCrFeMnNi high entropy alloy processed by milling and spark plasma sintering

Author: Loïc Perrière, P.-A. Goujon, Mathilde Laurent-Brocq, Benjamin Villeroy, G. Garcin, Judith Monnier, Rémy Pirès, Institut de Chimie et des Matériaux Paris-Est (ICMPE), and Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, microstructure, Sintering, Spark plasma sintering, 02 engineering and technology, mechanical properties, 010402 general chemistry, 01 natural sciences, Powder metallurgy, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], Materials Chemistry, nanostructured materials, Composite material, sintering, Mechanical Engineering, High entropy alloys, grain boundaries, Metals and alloys, Nanoindentation, 021001 nanoscience & nanotechnology, Microstructure, 0104 chemical sciences, powder metallurgy, Mechanics of Materials, Grain boundary, Crystallite, 0210 nano-technology
Abstract: International audience; Powder metallurgy is a promising processing path to produce high entropy alloys (HEA) with improved mechanical properties. According to this, a bulk CoCrFeMnNi alloy was milled with a wide range of conditions. It was shown that a powder which is micronic, approximately spherical and with nanometric crystallites could be produced by a cryo-milling which was followed by a short duration planetary milling. Next, this powder was fully densified by spark plasma sintering. According to X-ray diffraction, the single phase of the bulk alloy remains stable during both milling and sintering. However, carbides and oxides precipitate during sintering, as shown by scanning electron microscopy coupled with energy dispersive spectroscopy. Electron backscattered diffraction evidences that those precipitates limit the growth of grains. By nanoindentation measurements, it was shown that preparing a CoCrFeMnNi HEA by milling and sintering significantly increases the hardness compared to conventional processing by melting and casting. Moreover, the different strengthening contributions were calculated and analyzed. It revealed that grains have a strengthening contribution as described by the Hall & Petch law, contrary to crystallites.
Published: 2019
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16. Nanoscale investigation by TEM and STEM-EELS of the laser induced yellowing

Author: Marie Godet, Mandana Saheb, Nicolas Gauquelin, Judith Monnier, Eric Leroy, Julie Bourgon, Véronique Vergès-Belmin, Christine Andraud, Johan Verbeeck, Laboratoire de recherche des monuments historiques (LRMH), Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche pour la Conservation des Collections (CRCC), Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium), Universiteit Antwerpen [Antwerpen], Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Universiteit Antwerpen = University of Antwerpen [Antwerpen], Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Nanostructure, General Physics and Astronomy, 02 engineering and technology, Substrate (electronics), 01 natural sciences, law.invention, chemistry.chemical_compound, Crystallinity, Structural Biology, law, 0103 physical sciences, [CHIM]Chemical Sciences, General Materials Science, Irradiation, Magnetite, 010302 applied physics, Physics, Cell Biology, Hematite, 021001 nanoscience & nanotechnology, Laser, Chemistry, Chemical engineering, chemistry, Transmission electron microscopy, visual_art, visual_art.visual_art_medium, 0210 nano-technology
Abstract: International audience; Nd-YAG QS laser cleaning of soiled stone at 1064 nm can sometimes result in a more yellow appearance compared to other cleaning techniques. Especially in France, this yellowing effect is still considered as a major aesthetic issue by the architects and conservators. One explanation states that the yellowing is linked to the formation of iron-rich nanophase(s) through the laser beam interaction with black crusts that would re-deposit on the cleaned substrate after irradiation. To characterize these nanophases, a model crust containing hematite was elaborated and laser irradiated using a Nd-YAG QS laser. The color of the sample shifted instantaneously from red to a bright yellow and numerous particles were ablated in a visible smoke. Transmission electron microscopy (TEM) was used to examine the morphology and the crystallinity of the neo-formed compounds, both on the surface of the samples and in the ablated materials. In addition, an investigation of the chemical and structural properties of the nanophases was conducted by X-ray dispersive energy (EDX) and electron energy loss (EELS) spectroscopies. It was found that both the surface of the sample and the ablated materials are covered by crystallized nano-spheres and nano-residues, all containing iron and oxygen, sometimes along with calcium and sulfur. In particular an interfacial area containing the four elements was evidenced between some nanostructures and the substrate. Magnetite Fe3O4 was also identified at the nanoscale. This study demonstrates that the laser yellowing of a model crust is linked to the presence of iron-rich nanophases including CaxFeySzOδ nanostructures and magnetite Fe3O4 at the surface after irradiation.
Published: 2018
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17. Improved ZT in ball‐milled and spark plasma sintered Cu

Author: Judith Monnier, Gaëlle Delaizir, Christophe Candolfi, Bertrand Lenoir, Annie Pradel, Jean-Baptiste Vaney, Cédric Morin, Andrea Piarristeguy, and Eric Alleno
Subjects: Materials science, Metallurgy, 02 engineering and technology, Plasma, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, visual_art, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Ball (bearing), Ceramic, 0210 nano-technology
Published: 2018
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18. Short range order of As 40-x Cu x Te 60 glasses

Author: Ivan Kaban, António Pereira Gonçalves, Andrea Zitolo, Pál Jóvári, Brigitte Beuneu, Andrea Piarristeguy, Jozef Bednarcik, Judith Monnier, Christophe Candolfi, Gaëlle Delaizir, Jean-Baptiste Vaney, Institute for Solid State Physics [Budapest], Wigner Research Centre for Physics [Budapest], Hungarian Academy of Sciences (MTA)-Hungarian Academy of Sciences (MTA), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW Dresden), Leibniz Association, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Deutsches Elektronen-Synchrotron [Hamburg] (DESY), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Instituto Superior Técnico Universidade de Lisboa (C2TN), Hungarian Academy of Sciences (MTA), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Instituto Superior Técnico, Technical University of Lisbon, ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), and SOLEIL Synchrotron, L'Orme des Merisiers, 91198 Gif-sur-Yvette, France
Subjects: Diffraction, Materials science, Extended X-ray absorption fine structure, Coordination number, 02 engineering and technology, Reverse Monte Carlo, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Glass Modeling, Electronic, Optical and Magnetic Materials, Bond length, Crystallography, EXAFS, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Short range order, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Neutron, Absorption (chemistry), 010306 general physics, 0210 nano-technology
Abstract: International audience; Short range order of As40-xCuxTe60 (x = 0, 10, 20, 25, 30) glasses was studied by neutron- and X-ray diffraction, combined with extended X-ray absorption fine structure (EXAFS) measurements at the K-edges of all components. Large-scale structural models were generated by fitting the experimental datasets simultaneously in the framework of the reverse Monte Carlo simulation technique. These simulations revealed that As and Te atoms bind to about 3 and 2 As/Te neighbors, respectively, both of which possess Cu neighbors. The CuTe bond length is 2.57 ± 0.02 Å while the CuAs distance is as high as 2.86 ± 0.04 Å. The results further showed that besides As and Te, Cu atoms also bind to Cu. The total coordination number of Cu is significantly higher than 4 for the compositions x = 25 and 30.
Published: 2018
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19. Effect of Ni, Bi and Se on the tetrahedrite formation

Author: Elsa B. Lopes, Benjamin Villeroy, António Pereira Gonçalves, Bertrand Lenoir, C. Godart, and Judith Monnier
Subjects: Materials science, Scanning electron microscope, General Chemical Engineering, Tetrahedrite, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, General Chemistry, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, 0104 chemical sciences, Crystallography, Differential scanning calorimetry, Antimony, chemistry, Phase (matter), Thermoelectric effect, engineering, 0210 nano-technology, Spectroscopy
Abstract: Materials based on Cu12Sb4S13 tetrahedrites have been seen in recent years as promising materials for thermoelectric applications. However, the effect of small amounts of additional elements (used to tune the electrical transport properties) on the formation of the phases was not investigated. In this work we present such study, by means of powder X-ray diffraction, scanning electron microscopy complemented with energy-dispersive spectroscopy, and differential scanning calorimetry, using the Taguchi method to design the experiments. The effect of Ni, Bi and Se (i) in the volume percentage of tetrahedrite, (ii) in the temperature at which the Class III (tetrahedrite + chalcostibite + antimony → skinnerite) reaction occurs and (iii) in the final melting temperature of Cu12−xNixSb4−yBiyS13−zSez materials rapidly cooled from 950 °C was investigated. Se was observed to have a strong positive influence on the formation of tetrahedrite, while Ni and Bi were seen to promote the decrease of its volume percentage. A decrease of the Class III reaction and final melting temperatures was also observed after the introduction of Se, with Ni inducing the increase of the reaction and the decrease of the melting temperatures and Bi having only minor effects. The analysis of the microstructures indicate that high Ni concentrations lead to the first solidification of the NiS phase, while in the other compositions the (tetrahedrite/skinnerite) phase or mixtures of phases is first formed.
Published: 2016
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20. Stabilization of Metastable Thermoelectric Crystalline Phases by Tuning the Glass Composition in the Cu–As–Te System

Author: Gabriel J. Cuello, Christophe Candolfi, Gaëlle Delaizir, Julie Cornette, Jean-Baptiste Vaney, Judith Monnier, Andrea Piarristeguy, Vivian Nassif, Annie Pradel, António Pereira Gonçalves, Romain Viennois, Eric Alleno, Bertrand Lenoir, Elsa B. Lopes, Cédric Morin, Julie Carreaud, Maggy Colas, Mickaël Bigot, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Institut Laue-Langevin (ILL), ILL, CRG et Grands Instruments (CRG ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Chemistry, Scanning electron microscope, Analytical chemistry, Recrystallization (metallurgy), 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, 0104 chemical sciences, Amorphous solid, Inorganic Chemistry, symbols.namesake, Condensed Matter::Materials Science, visual_art, Thermoelectric effect, symbols, visual_art.visual_art_medium, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Ceramic, Physical and Theoretical Chemistry, 0210 nano-technology, Ternary operation, Raman scattering
Abstract: International audience; Recrystallization of amorphous compounds can lead to the stabilization of metastable crystalline phases, which offers an interesting way to unveil novel binary or ternary compounds and control the transport properties of the obtained glass ceramics. Here, we report on a systematic study of the Cu–As–Te glassy system and show that under specific synthesis conditions using the spark-plasma-sintering technique, the α-As2Te3 and β-As2Te3 binary phases and the previously unreported AsTe3 phase can be selectively crystallized within an amorphous matrix. The microstructures and transport properties of three different glass ceramics, each of them containing one of these phases with roughly the same crystalline fraction (∼30% in volume), were investigated in detail by means of X-ray diffraction, scanning electron microscopy, neutron thermodiffraction, Raman scattering (experimental and lattice-dynamics calculations), and transport-property measurements. The physical properties of the glass ceramics are compared with those of both the parent glasses and the pure crystalline phases that could be successfully synthesized. SEM images coupled with Raman spectroscopy evidence a “coast-to-island” or dendriticlike microstructure with microsized crystallites. The presence of the crystallized phase results in a significant decrease in the electrical resistivity while maintaining the thermal conductivity to low values. This study demonstrates that new compounds with interesting transport properties can be obtained by recrystallization, which in turn provides a tuning parameter for the transport properties of the parent glasses.
Published: 2018
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21. Thermoelectric properties and stability of glasses in the Cu-As-Te system

Author: Christophe Candolfi, Raphaël Escalier, Maggy Colas, Gaëlle Delaizir, Julie Carreaud, Bertrand Lenoir, António Pereira Gonçalves, Annie Pradel, Rozenn Le Parc, Michel Ribes, Judith Monnier, Jean-Baptiste Vaney, Andrea Piarristeguy, Cédric Morin, Eric Alleno, Julie Cornette, Elsa B. Lopes, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Instituto Superior Técnico Universidade de Lisboa (C2TN), ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), and Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: Materials science, Chalcogenide, Spark plasma sintering, 02 engineering and technology, 01 natural sciences, law.invention, symbols.namesake, chemistry.chemical_compound, Differential scanning calorimetry, Thermal conductivity, law, 0103 physical sciences, Thermoelectric effect, Materials Chemistry, Crystallization, glass, 010302 applied physics, 021001 nanoscience & nanotechnology, Thermoelectric materials, thermoelectric properties, chemistry, Chemical physics, Ceramics and Composites, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], chalcogenides, 0210 nano-technology, Raman spectroscopy
Abstract: International audience; Chalcogenide glasses and more importantly their glass-ceramics counterparts have been an interesting but very peculiar class of thermoelectric materials, with inherently low thermal conductivity (
Published: 2017
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22. Relationship between H2 sorption properties and aqueous corrosion mechanisms in A2Ni7 hydride forming alloys (A = Y, Gd or Sm)

Author: Lionel Goubault, Suzanne Joiret, Valérie Paul-Boncour, Judith Monnier, B. Puga, Junxian Zhang, Véronique Charbonnier, Patrick Bernard, Michel Latroche, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), SAFT [Bordeaux], Société des accumulateurs fixes et de traction (SAFT), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: Magnetic Measurements, Materials science, Hydrogen, Intermetallic, Energy Engineering and Power Technology, chemistry.chemical_element, Raman Micro-spectroscopy, 02 engineering and technology, 010402 general chemistry, Electrochemistry, 7. Clean energy, 01 natural sciences, Corrosion, Metal, Crystallinity, [CHIM]Chemical Sciences, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Renewable Energy, Sustainability and the Environment, Hydride, Metallurgy, Ni-MH batteries, 021001 nanoscience & nanotechnology, Metallic hydrides, 0104 chemical sciences, Chemical engineering, Electron diffraction, chemistry, 13. Climate action, visual_art, visual_art.visual_art_medium, TEM, 0210 nano-technology, [CHIM.OTHE]Chemical Sciences/Other
Abstract: International audience; Intermetallic compounds A 2 B 7 (A = rare earth, B = transition metal) are of interest for Ni‐MH batteries. Indeed they are able to absorb hydrogen reversibly and exhibit good specific capacity in electrochemical route. To understand the effect of rare earth on properties of interest such as thermodynamic, cycling stability and corrosion, we synthesized and studied three compounds: Y 2 Ni 7 , Gd 2 Ni 7 and Sm 2 Ni 7. Using Sieverts' method, we plot pc‐isotherms up to 10 MPa and study hydride stability upon solid‐gas cycling. Electrochemical cycling was also performed, as well as calendar and cycling corrosion study. Corrosion products were characterized by means of X‐ray diffraction, electron diffraction, Raman micro‐spectroscopy and scanning and transmission electron microscopies. Magnetic measurements were also performed to calculate corrosion rates. A corrosion mechanism, based on the nature of corrosion products, is proposed. By combining results from solid‐ gas cycling, electrochemical cycling and corrosion study, we attribute the loss in capacity either to corrosion or loss of crystallinity.
Published: 2016
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23. High-temperature thermoelectric properties of the β-As2−xBixTe3 solid solution

Author: Christophe Candolfi, António Pereira Gonçalves, Gaëlle Delaizir, Anne Dauscher, Eric Alleno, Annie Pradel, Elsa B. Lopes, Andrea Piarristeguy, Jean-Baptiste Vaney, Judith Monnier, Bertrand Lenoir, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Instituto Superior Técnico Universidade de Lisboa (C2TN), ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Scanning electron microscope, lcsh:Biotechnology, Doping, General Engineering, Analytical chemistry, Mineralogy, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, 01 natural sciences, lcsh:QC1-999, 0104 chemical sciences, Thermal conductivity, lcsh:TP248.13-248.65, Seebeck coefficient, Thermoelectric effect, X-ray crystallography, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], General Materials Science, 0210 nano-technology, lcsh:Physics, Solid solution
Abstract: International audience; Bi2Te3-based compounds are a well-known class of outstanding thermoelectric materials. β-As2Te3, another member of this family, exhibits promising thermoelectric properties around 400 K when appropriately doped. Herein, we investigate the high-temperature thermoelectric properties of the β-As2−xBixTe3 solid solution. Powder X-ray diffraction and scanning electron microscopy experiments showed that a solid solution only exists up to x = 0.035. We found that substituting Bi for As has a beneficial influence on the thermopower, which, combined with extremely low thermal conductivity values, results in a maximum ZT value of 0.7 at 423 K for x = 0.017 perpendicular to the pressing direction.
Published: 2016
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24. Low-Temperature Transport Properties of Bi-Substituted b-As2Te3 Compounds

Author: Christophe Candolfi, Anne Dauscher, Bertrand Lenoir, António Pereira Gonçalves, Gaëlle Delaizir, Annie Pradel, Judith Monnier, Eric Alleno, Cédric Morin, Jean-Baptiste Vaney, Julie Carreaud, Elsa B. Lopes, Andrea Piarristeguy, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Department of Quimica, ITN, ITN, Portugal, ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Diffraction, Materials science, Solid-state physics, Scanning electron microscope, Analytical chemistry, metastable thermoelectric phase, Mineralogy, 02 engineering and technology, Atmospheric temperature range, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Thermal conductivity, Electrical resistivity and conductivity, Materials Chemistry, Perpendicular, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Electrical and Electronic Engineering, 0210 nano-technology, arsenic telluride
Abstract: β-As2Te3 belongs to the family of Bi2Te3-based alloys, a well-known class of efficient thermoelectric materials around room temperature. As2Te3 exists in two allotropic configurations: α- and β-As2Te3, of which only the latter crystallizes in the same rhombohedral structure as Bi2Te3. Herein, we report on substitution of Bi for As in the As2−x Bi x Te3 system with x = 0.0, 0.015, 0.025, and 0.035. These samples have been characterized by x-ray diffraction and scanning electron microscopy. The transport properties have been measured at low temperatures (5 K to 300 K) in both directions, parallel and perpendicular to the pressing direction. The results are compared with those obtained in previous study on samples substituted by Sn. Compared with Sn, Bi allows for a clear decrease in electrical resistivity while maintaining the thermal conductivity below 1 W/(m K) over the whole temperature range. As a result, a comparable peak ZT value near 0.2 was obtained at room temperature.
Published: 2016
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25. Thermoelectric Properties of the alpha-As2Te3 Crystalline Phase

Author: Julie Carreaud, Gaëlle Delaizir, Cédric Morin, Jean-Baptiste Vaney, Anne Dauscher, Eric Alleno, António Pereira Gonçalves, Christophe Candolfi, Andrea Piarristeguy, Annie Pradel, Elsa B. Lopes, Judith Monnier, Bertrand Lenoir, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Department of Quimica, ITN, ITN, Portugal, ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Solid-state physics, Analytical chemistry, Mineralogy, Arsenic telluride, thermoelectric materials, high- and low-temperature thermoelectric properties, crystal structure, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Thermal conductivity, Powder metallurgy, Phase (matter), Thermoelectric effect, Materials Chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Electrical and Electronic Engineering, 0210 nano-technology, Anisotropy, Monoclinic crystal system
Abstract: International audience; As2Te3 exists in two crystallographic configurations: alpha- and beta-As2Te3, of which only the latter crystallizes in the same rhombohedral structure-type as Bi2Te3. While beta-As2Te3 shows interesting thermoelectric (TE) properties which can be adjusted through alloying, the transport properties of the monoclinic phase alpha-As2Te3, more thermodynamically stable than the beta-phase at room temperature, has not yet been studied thoroughly. We report here on the samples preparation by powder metallurgy, and on the microstructural characterization of polycrystalline alpha-As2Te3. Preliminary results on the electrical and thermal properties measured between 5 K and 523 K are also reported. Transport properties measurements were performed both along and perpendicular to the pressing direction indicating that the transport properties demonstrate some degree of anisotropy. Remarkably, low thermal conductivity values (below 1 W m-1 K-1 above 300 K) were measured suggesting that this compound may be an interesting platform to design novel TE materials with high efficiency.
Published: 2016
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26. Investigation of the Mechanisms Involved in the Sintering of Chalcogenide Glasses and the Preparation of Glass-Ceramics by Spark Plasma Sintering

Author: Mathieu Hubert, Gaëlle Delaizir, Xianghua Zhang, Yann Gueguen, Laurent Calvez, C. Godart, Judith Monnier, Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), LAboratoire de Recherche en Mécanique Appliquée (LARMAUR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Chalcogenide, Sintering, Spark plasma sintering, Chalcogenide glass, Space, 02 engineering and technology, Porous glass, 01 natural sciences, chemistry.chemical_compound, 0103 physical sciences, Materials Chemistry, [CHIM]Chemical Sciences, Ceramic, 010302 applied physics, Metallurgy, Optics, 021001 nanoscience & nanotechnology, Amorphous solid, Devitrification, chemistry, Transparent, visual_art, Transition, Ceramics and Composites, visual_art.visual_art_medium, Crystallization, 0210 nano-technology
Abstract: International audience; The sintering of the 80GeSe2-20Ga2Se3 chalcogenide glass composition as well as the preparation of the corresponding glass-ceramics has been investigated using pulsed current electrical sintering also known as spark plasma sintering. Amorphous powder has been synthesized by mechanical alloying. Due to the electrical insulating property of this glass composition, powder is heated mostly through the heating of the graphite die. It was found that densification of glass powder occurs through a viscous flow mechanism prior to devitrification. A model has been successfully applied to determine the viscosity and activation energy of the glass. This model has been confirmed by ball penetration technique to determine the glass sample viscosity.
Published: 2012
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27. A methodology for Raman structural quantification imaging and its application to iron indoor atmospheric corrosion products

Author: Ludovic Bellot-Gurlet, Philippe Dillmann, Denis Baron, Ivan Guillot, Delphine Neff, and Judith Monnier
Subjects: Materials science, Alloy steel, Metallurgy, Hyperspectral imaging, 02 engineering and technology, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Corrosion, symbols.namesake, Atmospheric corrosion, symbols, engineering, General Materials Science, 0210 nano-technology, Raman spectroscopy, Compound imaging, Structural imaging, Spectroscopy
Abstract: Raman structural imaging can extract original information in order to answer new questions raised in the recent studies on iron and low alloy steel corrosion. Up to now, this technique has allowed the extraction of the qualitative distribution of the compounds constituting the corrosion product layers. We propose here a methodology to extract quantitative parameters from Raman hyperspectral maps, executed by a home-developed software: LADIR-CAT. Specifically developed for iron corrosion quantitative component imaging, the approach and program operation are described. The LADIR-CAT is applied on ancient corroded iron samples originating from the Amiens cathedral (France) to establish the description and the composition of the corrosion system through quantitative compound imaging.
Published: 2010
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28. High thermoelectric performance in Sn-substituted α-As 2 Te 3

Author: Annie Pradel, Julie Carreaud, António Pereira Gonçalves, Andrea Piarristeguy, Christophe Candolfi, Eric Alleno, Bertrand Lenoir, Judith Monnier, Elsa B. Lopes, Jean-Baptiste Vaney, Anne Dauscher, Gaëlle Delaizir, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Instituto Superior Técnico Universidade de Lisboa (C2TN), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), and Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: Materials science, Doping, Analytical chemistry, Nanotechnology, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 7. Clean energy, 01 natural sciences, 0104 chemical sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Thermoelectric generator, Thermal conductivity, Seebeck coefficient, Thermoelectric effect, Materials Chemistry, Crystallite, 0210 nano-technology, Electronic band structure, Monoclinic crystal system
Abstract: International audience; Lead chalcogenides PbX (X = Te, Se, S) have been the materials of choice for thermoelectric power generation at mid-range temperatures (500–700 K). Here, we report on a new family of chalcogenides α-As2Te3 that exhibit similar thermoelectric performances near 500 K. Sn doping in p-type polycrystalline α-As2−xSnxTe3 (x ≤ 0.075) provides an efficient control parameter to tune the carrier concentration leading to thermopower values that exceed 300 μV K−1 at 500 K. Combined with the structural complexity of the monoclinic lattice that results in extremely low thermal conductivity (0.55 W m−1 K−1 at 523 K), a peak ZT value of 0.8 is achieved at 523 K for x = 0.05. A single-parabolic band model is found to capture well the variations in the transport properties with the Sn concentration and suggests that higher ZT values could be achieved through band structure engineering. These results surpass those obtained in the sister compounds β-As2−xSnxTe3 and further show that α-As2Te3 based materials are competitive with other chalcogenides for thermoelectric applications at intermediate temperatures.
Published: 2016
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29. Electronic structure, low-temperature transport and thermodynamic properties of polymorphic β-As 2 Te 3

Author: Julie Carreaud, Anne Dauscher, Jean-Baptiste Vaney, António Pereira Gonçalves, Bertrand Lenoir, Jean-Claude Crivello, Elsa B. Lopes, Annie Pradel, Andrea Piarristeguy, Gaëlle Delaizir, Christophe Candolfi, Cédric Morin, Eric Alleno, Judith Monnier, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Instituto Superior Técnico Universidade de Lisboa (C2TN), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Universidade de Lisboa (ULISBOA), Projet ANR Progelet, ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Universidade de Lisboa = University of Lisbon (ULISBOA)
Subjects: Materials science, Condensed matter physics, business.industry, Band gap, General Chemical Engineering, Doping, Degenerate energy levels, 02 engineering and technology, General Chemistry, Electronic structure, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Semiconductor, Thermal, Thermoelectric effect, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Ground state, business
Abstract: International audience; β-As2Te3 belongs to the prominent family of Bi2Te3-based materials, which show excellent thermoelectric properties near room temperature. In this study, we report a joint theoretical and experimental investigation of its electronic and thermal properties at low temperatures (5–300 K). These results are complemented by specific heat measurements (1.8–300 K) that provide further experimental evidence of the first order lattice distortion undergone by β-As2Te3 near 190 K. Data taken on cooling and heating across this transition show that the lattice distortion has little influence on the electronic properties and further evidence a weak hysteretic behavior. Although first-principles calculations predict a semiconducting ground state, these measurements show that β-As2Te3 behaves as a degenerate p-type semiconductor with a high carrier concentration of 1020 cm−3 at 300 K likely due to intrinsic defects. Calculations of the vibrational properties indicate that the extremely low lattice thermal conductivity values (0.8 W m−1 K−1 at 300 K) mainly originate from low-energy Te optical modes that limit the energy window of the acoustic branches. This limited ability to transport heat combined with a relatively large band gap suggest that high thermoelectric efficiency could be achieved in this compound when appropriately doped.
Published: 2016
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30. High-Temperature Thermoelectric Properties of Sn-Doped β-As 2Te3

Author: Anne Dauscher, Julie Carreaud, Gaëlle Delaizir, Eric Alleno, Judith Monnier, Christophe Candolfi, Andrea Piarristeguy, Bertrand Lenoir, Jean-Baptiste Vaney, Cédric Morin, Annie Pradel, António Pereira Gonçalves, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Universidade de Lisboa = University of Lisbon (ULISBOA), Projet ANR, ANR-11-PRGE-0010,VTG,Verres et vitrocéramiques de chalcogénures en tant que matériaux thermoélectriques pour des applications autour de l'ambiante(2011), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and Universidade de Lisboa (ULISBOA)
Subjects: Thermoelectric cooling, Materials science, business.industry, Doping, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, 01 natural sciences, 7. Clean energy, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Thermoelectric generator, Thermal conductivity, 13. Climate action, Thermoelectric effect, Electronic engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, Electric power, Electronics, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract: Thermoelectric energy conversion is a versatile and an all-solidstate technology that can be used either in cooling systems (Peltier effect) or in electrical power generators (Seebeck effect). Because thermoelectric generators convert directly temperature differences into electrical power, this technology, thanks to its reliability, long lifetime, and vibration-free character, has been successfully used for decades for powering deep space missions. Thermoelectric generators may be equally suitable for waste-heat recovery from automotive exhaust systems or various industrial processes. Near room temperature, Peltier coolers are applied as solid-state heat pumps for cooling electronic devices, for instance. [ 1,2 ] The active parts of thermoelectric devices are composed of n - and p -type materials whose intrinsic transport properties govern the overall conversion effi ciency. The potential of a given material for thermoelectric applications is quantitatively expressed by the dimensionless fi gure of merit ZT defi ned as α ρ κ κ κ κ
Published: 2015
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31. Structural and Hydrogen Storage Properties of Y2Ni7 Deuterides Studied by Neutron Powder Diffraction

Author: Virginie Serin, César Magén, Judith Monnier, Junxian Zhang, Lionel Goubault, Véronique Charbonnier, Patrick Bernard, Michel Latroche, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), SAFT, Direction de la Recherche, Université de Bordeaux (UB), University of Zaragoza - Universidad de Zaragoza [Zaragoza], Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut National des Sciences Appliquées (INSA)-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées (INSA)-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Diffraction, Hydrogen capacities, Hydrogen, X ray diffraction, Absorption cycles, Neutron diffraction, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Crystal structure, Hydrogen storage properties, 010402 general chemistry, 01 natural sciences, Hydrogen storage, Nickel, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Plateau pressures, ComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION, Dehydrogenation, Physical and Theoretical Chemistry, Deuterium compounds, Room temperature, Neutrons, [PHYS]Physics [physics], Structural properties, Cobalt, States of charges, Neutron powder diffraction, 021001 nanoscience & nanotechnology, Unit cell parameters, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Crystallography, Hydrogenation properties, General Energy, chemistry, Deuterium, 0210 nano-technology, Powder diffraction, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract: cited By 4; International audience; The crystal structure and hydrogenation properties of Gd2Co7-type Y2Ni7 were investigated by X-ray diffraction (XRD), Sievert's method, and neutron powder diffraction. Unlike Nd2Ni7 and La2Ni7, Y2Ni7 exhibits three plateau pressures and forms three hydrides at room temperature. The maximum hydrogen capacity reaches 8.9 H/fu at 10 MPa at the first absorption cycle. The compound can be cycled by a solid-gas route, and structural properties are fully recovered after dehydrogenation. For the first time, the structural properties of rhombohedral A2B7Dx deuterides were studied. They were investigated by neutron powder diffraction at three different states of charge (x = 2.1, 4.1, and 8.8). Deuterium positions as well as variation of unit cell parameters are given and discussed in this paper. (Figure Presented).
Published: 2015
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32. XAS and XRD in situ characterisation of reduction and reoxidation processes of iron corrosion products involved in atmospheric corrosion

Author: Ivan Guillot, Eddy Foy, Mandana Saheb, Denis Testemale, Judith Monnier, Philippe Dillmann, Solenn Reguer, François Mirambet, Laboratoire Pierre Süe (LPS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etude de Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Matériaux, Rayonnements, Structure (MRS), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Centre de recherche et de restauration des musées de France (C2RMF), Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture et de la Communication (MCC), Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Matériaux, Rayonnements, Structure (NEEL - MRS), Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and Université d'Orléans (UO)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne
Subjects: X-ray absorption spectroscopy, Materials science, 020209 energy, General Chemical Engineering, [SDE.MCG]Environmental Sciences/Global Changes, Inorganic chemistry, Maghemite, 02 engineering and technology, General Chemistry, engineering.material, 021001 nanoscience & nanotechnology, Corrosion, Electrochemical cell, Ferrihydrite, chemistry.chemical_compound, chemistry, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, 0202 electrical engineering, electronic engineering, information engineering, engineering, General Materials Science, Lepidocrocite, 0210 nano-technology, Iron(II) hydroxide, ComputingMilieux_MISCELLANEOUS, Magnetite
Abstract: An electrochemical cell has been used for performing in situ X-ray diffraction and absorption spectroscopy structural characterisation by transmission during electrochemical measurements. This cell has been used to reduce lepidocrocite and ferrihydrite, two iron oxides involved in low-carbon steel atmospheric corrosion mechanisms. The reduced phases have been identified in situ as magnetite and iron II hydroxide, two phases that can play a key role in corrosion mechanisms. The reoxidation of the reduced phases was also studied, and lead to the formation of magnetite/maghemite and to the formation of the initial reducible phases lepidocrocite and ferrihydrite.
Published: 2014
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33. A comprehensive study of the crystallization of Cu-As-Te glasses: microstructure and thermoelectric properties

Author: Eric Alleno, Andrea Piarristeguy, Gabriel J. Cuello, Gaëlle Delaizir, Annie Pradel, Jean-Baptiste Vaney, Raphaël Escalier, Eckhard Müller, Claude Godart, Christophe Candolfi, Elsa B. Lopes, Michel Ribes, O. Rouleau, Pawel Ziolkowski, Anne Dauscher, António Pereira Gonçalves, Bertrand Lenoir, Judith Monnier, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Institut Laue-Langevin (ILL), ILL, German Aerospace Center (DLR), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Spark plasma sintering, SPS, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, Crystal, Cu-As-Te, chalcogenide, law, Phase (matter), Seebeck coefficient, Thermoelectric effect, General Materials Science, Crystallization, Renewable Energy, Sustainability and the Environment, General Chemistry, 021001 nanoscience & nanotechnology, Microstructure, thermoelectric properties, 0104 chemical sciences, Amorphous solid, Crystallography, Chemical physics, glass-ceramics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, thermoelectrics
Abstract: International audience; We report a thorough experimental study on the microstructure, thermal behavior and thermoelectric properties of the amorphous composition Cu15As30Te55 and the glass-ceramics related-compounds synthesized by Spark Plasma Sintering (SPS) technique. Varying the conditions of the SPS process enables the synthesis of composite glassy-crystalline samples with different crystal/glass ratios. Such treatments result in complex microstructures composed of large glassy domains where nanocrystals of the metastable β-As2Te3 phase are embedded. These domains are separated by regions of dendritic crystalline phase surrounded by a Cu-rich glassy matrix. The presence of β-As2Te3, confirmed by both powder x-ray diffraction and scanning electron microscopy, suggests that pressure and/or internal stresses plays an important role in stabilizing this phase. This conclusion is further supported by neutron thermodiffraction experiments revealing a sharp crossover from the β-As2Te3 to the stable α-As2Te3 phase at temperatures below that of the SPS treatment. Transport properties measurements show that the presence of crystalline fraction significantly lowers the electrical resistivity by four orders of magnitude. However, the probable intrinsic n-type behavior of β-As2Te3 has a detrimental influence on the thermopower values. Even though the partial crystallization of the glassy matrix leads to an increase in the thermal conductivity, the measured values remain on the order of 1 W.m-1.K-1 at 300 K. Besides an overall increase in the dimensionless figure of merit ZT, our results demonstrate that the partial crystallization of an amorphous matrix is an efficient tool to tune the electrical resistivity over several orders of magnitude while maintaining low thermal conductivity values.
Published: 2013
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34. Thermal stability and thermoelectric properties of CuxAs40−xTe60−ySey semiconducting glasses

Author: António Pereira Gonçalves, Jean-Baptiste Vaney, Eric Alleno, Christophe Candolfi, Andrea Piarristeguy, Annie Pradel, Anne Dauscher, Michel Ribes, Gaëlle Delaizir, Claude Godart, Elsa B. Lopes, Judith Monnier, Bertrand Lenoir, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Chalcogenide, Analytical chemistry, Mineralogy, Chalcogenide glass, 02 engineering and technology, Thermoelectric Materials at room temperature, 010402 general chemistry, 01 natural sciences, Inorganic Chemistry, chemistry.chemical_compound, Thermal conductivity, Thermoelectric effect, Materials Chemistry, Thermal stability, Physical and Theoretical Chemistry, X-ray spectroscopy, Glassy semiconductors, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, chemistry, 13. Climate action, Content (measure theory), Ceramics and Composites, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: We report on the thermal behavior and thermoelectric properties of bulk chalcogenide glasses in the systems Cu{sub x}As{sub 40−x}Te{sub 60} (20≤x≤32.5) and Cu{sub x}As{sub 40−x}Te{sub 60−y}Se{sub y}, (0≤y≤9) synthesized by conventional melt-quenching techniques. The thermal stability of these glasses was probed by differential scanning calorimetry to determine the characteristic T{sub g} and ΔT temperatures, both of which increasing noticeably with y. Thermoelectric properties were found to be mainly influenced by the Cu concentration with respect to the Se content. The thermal conductivity is practically composition-independent throughout the compositional range covered. A maximum ZT value of 0.02 at 300 K increasing to 0.06 at 375 K was achieved for the composition Cu{sub 30}As{sub 10}Te{sub 54}Se{sub 6}. - Graphical abstract: Effect of substitution of Te by Se and As by Cu on thermal stability and thermoelectric properties of Cu{sub x}As{sub 40−x}Te{sub 60−y}Se{sub y} semiconducting glasses. - Highlights: • We studied substitution of Te by Se in Cu–As–Te thermoelectric chalcogenide glasses. • Cu–As–Te–Se glasses were prepared by conventional melt-quenching method. • Se inclusion increases thermal stability in Cu–As–Te glasses. • Increasing copper concentration enhances thermoelectric properties. • ZT of 0.02 was achieved at 300 K and 0.06 at 375 K.
Published: 2013
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35. A comparative study of Spark Plasma Sintering (SPS), Hot Isostatic Pressing (HIP) and microwaves sintering techniques on p-type Bi2Te3 thermoelectric properties

Author: O. Rouleau, Pierre-David Szkutnik, Judith Monnier, Guillaume Bernard-Granger, Dominique Goeuriot, Claude Godart, Sébastien Saunier, Christelle Navone, Julia Simon, Mathieu Soulier, R. Grodzki, Gaëlle Delaizir, O. Kim-Hak, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Département Mécanique et Procédés d'Elaboration (MPE-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SMS, UMR 5146 - Laboratoire Claude Goux (LCG-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), and Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Subjects: 010302 applied physics, Materials science, Mechanical Engineering, Metallurgy, Sintering, Spark plasma sintering, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, Thermoelectric materials, 01 natural sciences, Mechanics of Materials, Hot isostatic pressing, visual_art, Powder metallurgy, 0103 physical sciences, Thermoelectric effect, visual_art.visual_art_medium, General Materials Science, Ceramic, 0210 nano-technology
Abstract: International audience; The sintering of a synthesized p-type Bi2Te3 nano-powder has been investigated by three different techniques. Sintering techniques such as Hot Isostatic Pressing (HIP), microwave sintering and Spark Plasma Sintering (SPS) also known as electric field-assisted sintering technique (FAST) have been compared in terms of sintering parameters i.e. temperature, pressure, and power, microstructure and thermoelectric properties of the prepared ceramics. This study demonstrates that the highest figure of merit ZT has been obtained using microwaves or SPS techniques. Ceramics observations reveal differences in microstructure as well as the presence of intra-granular precipitates in the pellets sintered by the three techniques. We finally conclude about the relationship between properties and microstructure to get optimum thermoelectric materials.
Published: 2012
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36. Semiconducting glasses: A new class of thermoelectric materials?

Author: António Pereira Gonçalves, Annie Pradel, Andrea Piarristeguy, Bertrand Lenoir, Elsa B. Lopes, Claude Godart, Patrick Ochin, Judith Monnier, Jean-Baptiste Vaney, Gaëlle Delaizir, Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Chalcogenide, Mineralogy, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Inorganic Chemistry, chemistry.chemical_compound, Thermal conductivity, Electrical resistivity and conductivity, Thermal, Thermoelectric effect, Materials Chemistry, Physical and Theoretical Chemistry, High copper, Semiconducting glasses, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, Engineering physics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, chemistry, Ceramics and Composites, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Tellurium, Thermoelectric glasses
Abstract: International audience; The deeper understanding of the factors that affect the dimensionless figure of merit, ZT, and the use of new synthetic methods has recently led to the development of novel systems with improved thermoelectric performances. Albeit up to now with ZT values lower than the conventional bulk materials, semiconducting glasses have also emerged as a new family of potential thermoelectric materials. This paper reviews the latest advances on semiconducting glasses for thermoelectric applications. Key examples of tellurium-based glasses, with high Seebeck coefficients, very low thermal conductivities and tunable electrical conductivities, are presented. ZT values as high as 0.2 were obtained at room temperature for several tellurium-based glasses with high copper concentrations, confirming chalcogenide semiconducting glasses as good candidates for high-performance thermoelectric materials. However, the temperature stability and electrical conductivity of there ported glasses are still not good enough for practical applications and further studies are still needed to enhance them.
Published: 2012
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37. An innovative approach to develop highly performant chalcogenide glasses and glass-ceramics transparent in the infrared range

Author: Gaëlle Delaizir, Judith Monnier, Xianghua Zhang, Hongli Ma, Laurent Calvez, Mathieu Hubert, Claude Godart, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Groupe d'Etudes des Matériaux Hétérogènes (GEMH), Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: Materials science, Chalcogenide, Infrared, Mie scattering, Spark plasma sintering, Sintering, 02 engineering and technology, 7. Clean energy, 01 natural sciences, chemistry.chemical_compound, symbols.namesake, Optics, 0103 physical sciences, Ceramic, Rayleigh scattering, 010302 applied physics, business.industry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Amorphous solid, chemistry, visual_art, visual_art.visual_art_medium, symbols, Optoelectronics, 0210 nano-technology, business
Abstract: International audience; An innovative way to produce chalcogenide glasses and glass-ceramics for infrared devices is reported. This new method of synthesis at low temperature combining ball-milling and sintering by SPS (Spark Plasma Sintering) is a technological breakthrough to produce efficient infrared chalcogenide glasses and glass-ceramics. This technique will offer the possibility to strongly decrease the cost of infrared devices and to produce new chalcogenide glasses. It will also permit to increase the potential of some glass compositions by allowing their shaping at desired dimensions.
Published: 2011
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38. A corrosion study of the ferrous medieval reinforcement of the Amiens cathedral. Phase characterisation and localisation by various microprobes techniques

Author: Eric Leroy, Eddy Foy, Ivan Guillot, S. Reguer, Ludovic Legrand, Ludovic Bellot-Gurlet, Philippe Dillmann, Delphine Neff, Judith Monnier, Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université d'Orléans (UO)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS), Synchrotron Soleil, DiffAbs beamline, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France (SYNCHROTRON SOLEIL, DIFFABS BEAMLINE, SAINT-AUBIN, BP 48, 91192 GIF-SUR-YVETTE CEDEX, FRANCE), Synchrotron Soleil, DiffAbs beamline, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France, and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)
Subjects: Goethite, Materials science, Akaganéite, 020209 energy, General Chemical Engineering, Iron, Structural quantification, Structural imaging, 02 engineering and technology, engineering.material, [SHS.MUSEO]Humanities and Social Sciences/Cultural heritage and museology, Corrosion, Imaging, Synchrotron, [SPI.MAT]Engineering Sciences [physics]/Materials, Ferrihydrite, Crystallinity, Iron corrosion, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Quantification, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, Lepidocrocite, Metallurgy, General Chemistry, Microbeam, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Feroxyhyte, visual_art, Raman spectroscopy, engineering, visual_art.visual_art_medium, 0210 nano-technology, Atmospheric corrosion, Archaeological artefacts, [CHIM.OTHE]Chemical Sciences/Other
Abstract: International audience; In this study, long term corrosion mechanisms are approached through the characterisation of corrosion products formed on ancient artefacts over 500 years. Thirty-one artefacts were sampled in the Amiens cathedral. The thick corrosion product layers have been characterised at a microscopic scale by coupling complementary microbeam analytical techniques (SEM-EDS, Raman microspectroscopy, X-ray microdiffraction and microfluorescence, X-ray absorption microspectroscopy under synchrotron radiation). The main phase of the corrosion layer is goethite but lepidocrocite and akaganeite are also present locally in the corrosion layer. In addition, the presence of low crystallinity phases (feroxyhyte and/or ferrihydrite) is showed. These phases are electrochemically reactive, thus they could play a key role in the corrosion mechanisms.
Published: 2010
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39. Raman studies of corrosion layers formed on archaeological irons in various media

Author: Mandana Saheb, Ludovic Bellot-Gurlet, Delphine Neff, Philippe Dillmann, Solenn Reguer, Judith Monnier, Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Pierre Süe (LPS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Division Expériences - DIFFABS Synchrotron Soleil (Synchrotron Soleil), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM), Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), and Université d'Orléans (UO)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne
Subjects: Materials science, Iron, Mineralogy, Structural imaging, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, [SHS.MUSEO]Humanities and Social Sciences/Cultural heritage and museology, 01 natural sciences, Corrosion, [SPI.MAT]Engineering Sciences [physics]/Materials, symbols.namesake, Iron corrosion, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Metallurgy, Hyperspectral imaging, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Archaeology, 0104 chemical sciences, Raman spectroscopy, symbols, Long term corrosion, 0210 nano-technology, Ancient artefact, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract: International audience; The description and identification of corrosion products formed on archaeological iron artefacts need various approaches at different observation scales. Among analytical techniques available to document phase structure at the microscopic range, Raman spectroscopy offers sensitivity and discrimination between iron corrosion products with an easy implementation. Results obtained for iron artefacts corrosion in soils and atmosphere are presented. Corrosion forms observed for anoxic and aerated soils on one hand and indoor atmosphere on the other are documented. Beyond the identification and organisation of corrosion products through hyperspectral imaging, Raman micro-spectroscopy could also provide quantitative phase proportions which will be needed in the proposition of reactivity diagnosis indicators.
Published: 2009
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40. Study of archaeological artefacts to refine the model of iron long-term indoor atmospheric corrosion

Author: Ludovic Bellot-Gurlet, Ivan Guillot, Delphine Neff, Eddy Foy, Ludovic Legrand, Solenn Reguer, Judith Monnier, François Mirambet, Stéphane Perrin, Emmanuel Rocca, Philippe Dillmann, Laboratoire Pierre Süe (LPS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement (LAMBE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Évry-Val-d'Essonne (UEVE)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de chimie du solide minéral (LCSM), Université Paul Verlaine - Metz (UPVM)-Université Henri Poincaré - Nancy 1 (UHP)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM), Laboratoire de recherche des monuments historiques (LRMH), Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude de la Corrosion Aqueuse (LECA), Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Physico-Chimie (DPC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), and Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Goethite, Akaganéite, XAS, 020209 energy, Iron, Mineralogy, 02 engineering and technology, engineering.material, Rust, Microscopic scale, Corrosion, Imaging, Synchrotron, [SPI.MAT]Engineering Sciences [physics]/Materials, Ferrihydrite, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, Lepidocrocite, Chemistry, Characterisation, X-ray absorption spectroscopy, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Archaeology, Term (time), Nuclear Energy and Engineering, visual_art, Raman spectroscopy, engineering, visual_art.visual_art_medium, 0210 nano-technology, Atmospheric corrosion
Abstract: International audience; The study of long-term indoor atmospheric corrosion is involved in the field of the interim storage of nuclear wastes. Indeed study of archaeological artefacts is one of the only mean to gather information on very long periods. Concerning ancient items, due to the complexity of the system, it is necessary to couple many analytical techniques from the macro to the microscopic scale. This enables to propose a description of the Amiens cathedral chain rust layers, made of a matrix of goethite, with lepidocrocite and akaganeite locally present and marbling of a poor crystallized phase associated to ferrihydrite. Electrochemical measurements permit to study the reduction capacity of the rust layer and to draw reduction mechanisms of the so-called active phases, by in situ experiments coupled with X-ray diffraction and X-ray absorption spectroscopy.
Published: 2008
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