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1,229 results on '"Institut de Recherche sur les CERamiques (IRCER)"'

1. Intégration de nanofils de dioxyde de vanadium monocristallins dans des composants pour l'électronique des hautes fréquences

Author

Orlianges, Jean-Christophe, Crunteanu, Aurelian, Boulle, Alexandre, Sirjita, Eduard-Nicolae, Masson, Anaïs, Thery, Virginie, Tardif, S., Micha, Jean-Sébastien, RF-ELITE : RF-Electronique Imprimée pour les Télécommunications et l'Energie (XLIM-RFEI), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Excellence Sigma-Lim 'Des matériaux et composants céramiques spécifiques aux systèmes communicants intégrés, sécurisés, et intelligents' [Labex] (Labex ∑-lim), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-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 des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Ecole Nationale Supérieure de Céramique Industrielle (ENSCI), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Nanostructures et Rayonnement Synchrotron (NRS ), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), European Synchroton Radiation Facility [Grenoble] (ESRF), SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé (SYMMES), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), 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), ENSIL-ENSCI Formation: Céramique Industrielle, Université de Limoges (UNILIM), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), and Institut de Recherche sur les CERamiques (IRCER)

Subjects
commutateurs RF, micro-ondes, VO2, dioxyde de vanadium, nanofils, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2022

2. Characterizing the ZrC(111)/c-ZrO2(111) Hetero-Ceramic Interface:First Principles DFT and Atomistic Thermodynamic Modeling

Author

Eric Osei-Agyemang, Jean-François Paul, Romain Lucas, Sylvie Foucaud, Sylvain Cristol, Anne-Sophie Mamede, Nicolas Nuns, Ahmed Addad, Université de Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, University at Buffalo [SUNY] [SUNY Buffalo], Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181, Institut de Recherche sur les CERamiques [IRCER], Unité Matériaux et Transformations - UMR 8207 [UMET], University at Buffalo [SUNY] (SUNY Buffalo), State University of New York (SUNY), Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Unité Matériaux et Transformations - UMR 8207 (UMET), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and ANR-12-BS08-0004,CollZSiC,Elaboration de nanocomposites coeur/coquille : ZrC/SiC(2012)

Subjects
Organic Chemistry, ZrC, Pharmaceutical Science, [CHIM.MATE]Chemical Sciences/Material chemistry, DFT, thermodynamic, Analytical Chemistry, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Chemistry (miscellaneous), Drug Discovery, Molecular Medicine, Physical and Theoretical Chemistry
Abstract

International audience; The mechanical and physical properties of zirconium carbide (ZrC) are limited to its ability to deteriorate in oxidizing environments. Low refractory oxides are typically formed as layers on ZrC surfaces when exposed to the slightest concentrations of oxygen. However, this carbide has a wide range of applications in nuclear reactor lines and nozzle flaps in the aerospace industry, just to name a few. To develop mechanically strong and oxygen-resistant ZrC materials, the need for studying and characterizing the oxidized layers, with emphasis on the interfacial structure between ZrC and the oxidized phases, cannot be understated. In this paper, the ZrC(111)//c-ZrO2 (111) interface was studied by both finite temperature molecular dynamic simulation and DFT. The interfacial mechanical properties were characterized by the work of adhesion which revealed a Zr|OO|Zr|OO//ZrC(111) interface model as the most stable with an oxygen layer from ZrO2 being deposited on the ZrC(111) surface. Further structural analysis at the interface showed a crack in the first ZrO2 layer at the interfacial region. Investigations of the electronic structure using the density of state calculations and Bader charge analysis revealed the interfacial properties as local effects with no significant impacts in the bulk regions of the interface slab.

Published
2022

3. Fabrication and optical properties of transparent fine-grained Zn1.1Ga1.8Ge0.1O4 and Ni2+ (or Cr3+)-doped Zn1.1Ga1.8Ge0.1O4 spinel ceramics

Author

Julie Carreaud, Jean-René Duclere, Yann Launay, Nicolas Tessier-Doyen, David S. Smith, Mathieu Allix, Vincent Couderc, Gaëlle Delaizir, Sébastien Chenu, Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), 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), ANR-10-LABX-0074-01, European Commission, EC, European Regional Development Fund, ERDF: AAPR2021-2020-11934110, and ANR-10-LABX-0074,Sigma-LIM,From specific ceramic materials and components to integrated, secured and intelligent communication systems(2010)

Subjects
Zinc gallate (ZnGa2O4), Optical properties, Persistent luminescence, Spark Plasma Sintering (SPS), Materials Chemistry, Ceramics and Composites, [CHIM.MATE]Chemical Sciences/Material chemistry, Transparent spinel ceramics
Abstract

International audience; For the first time, a Zn1.1Ga1.8Ge0.1O4 transparent spinel ceramic has been fully densified by spark plasma sintering. XRD measurements show that this ceramic is composed of a pure cubic spinel phase. SEM analysis revealed a homogeneous and dense microstructure with the average grain size being 200 ± 100 nm. The transmittance of these fine-grained ceramics reached 70 % in the visible range and is very close to 80 % at 2 µm, thus close to the Tmax value deduced from the measurement of the refractive index. The ceramics exhibit excellent mechanical properties with a Young modulus of 222 GPa, a Vickers hardness of 14.25 GPa and a thermal conductivity of 7.3 W.m−1. K−1. By doping with Cr3+ ions, transparent Zn1.1Ga1.8Ge0.1O4 ceramics present both a red luminescence and a long-lasting afterglow during several minutes. Moreover, a near infrared broadband emission at 1.3 µm is also achieved with Ni2+ ions.

Published
2023

4. Structural and electrical characterization of niobium dioxide thin films presenting a metal-to-insulator transition

Author

Sirjita, Eduard-Nicolae, Boulle, Alexandre, Mayet, Richard, Orlianges, Jean-Christophe, Crunteanu, Aurelian, RF-ELITE : RF-Electronique Imprimée pour les Télécommunications et l'Energie (XLIM-RFEI), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), 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), MRS Singapour, ANR-10-LABX-0074,Sigma-LIM,From specific ceramic materials and components to integrated, secured and intelligent communication systems(2010), and European Project: 712590,H2020 FET Open 'Technologies futures et émergentes',829153,PETACom(2019)

Subjects
[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.MAT]Engineering Sciences [physics]/Materials
Published
2023

5. Tungsten-doped VO2 films for large area modulation of THz waves

Author

Sirjita, Eduard-Nicolae, Boulle, A., Mayet, Richard, Orlianges, Jean-Christophe, Crunteanu, Aurelian, RF-ELITE : RF-Electronique Imprimée pour les Télécommunications et l'Energie (XLIM-RFEI), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), 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 du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), MRS Singapour, ANR-10-LABX-0074,Sigma-LIM,From specific ceramic materials and components to integrated, secured and intelligent communication systems(2010), and European Project: 712590,H2020 FET Open 'Technologies futures et émergentes',829153,PETACom(2019)

Subjects
[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2023

6. Crystallization of glass materials into transparent optical ceramics

Author

Milisavljevic, Iva, Pitcher, Michael, Li, Jianqiang, Chenu, Sébastien, Allix, Mathieu, Wu, Yiquan, Alfred University, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), University of Science and Technology Beijing [Beijing] (USTB), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), 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), National Science Foundation (NSF) CAREER grant [1554094], and ONR Office of Naval Research grant [N00014-21-1-2394]

Subjects
optical materials, Mechanics of Materials, Full bulk glass crystallization, Mechanical Engineering, microstructure, Materials Chemistry, Metals and Alloys, dense, [CHIM]Chemical Sciences, metastable structure, transparent ceramics
Abstract

International audience; Latest advancements in transparent ceramics development have ensured a mainstream research interest in this family of materials. Crystallization of glass into transparent ceramics has emerged recently as an alternative but complementary trajectory for obtaining transparent ceramics, which circumvents some of the long-standing technical difficulties associated with traditional transparent ceramics processing. The full bulk glass crystallization allows for the synthesis of high-density/low-porosity transparent ceramics of stable and metastable phases or even non-cubic structures, which are difficult to obtain using the traditional processing methods. This article presents a brief survey of the science of the transparency of ceramics and a detailed overview of the materials systems and techniques used for the preparation of transparent ceramics through the glass crystallization route. Finally, the review provides authors' insights into the future trends and research directions aimed to encourage a widespread application of glass crystallization into transparent ceramics in the fabrication of next-generation materials.

Published
2022

7. Ceramic nanocomposites prepared via the in situ formation of a novel TiZrN2 nanophase in a polymer-derived Si3N4 matrix

Author

Bechelany, Mirna Chaker, Lale, Abhijeet, Balestrat, Maxime, Gervais, Christel, Malo, Sylvie, Nishihora, Rafael Kenji, Bernard, Samuel, Laboratoire des Multimatériaux et Interfaces (LMI), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-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), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), and ANR-16-CE08-0026,CARAPASS,NANOCOMPOSITES CARBURES ET CARBONITRURES COMME MATERIAUX SELECTIFS POUR LA CONVERSION PHOTOTHERMIQUE(2016)

Subjects
Materials Chemistry, Ceramics and Composites, Polymer-derived ceramics, Si3N4, TiZrN2, [CHIM.MATE]Chemical Sciences/Material chemistry, Nanocomposites
Abstract

International audience; The first demonstration of a nanoscaled titanium zirconium nitride (TiZrN2) single-phase isolated during the preparation of polymer-derived silicon nitride (Si3N4) matrix nanocomposites is discussed. We employed a polysilazane, which was chemically modified with Zr[N(CH2CH3)2]4 and Ti[N(CH3)2]4 then ammonolyzed before a pyrolysis step under ammonia (1000 °C) and a heat-treatment in flowing nitrogen (1000–1700 °C). Based on a careful control of the precursor chemistry in the early stage of the process and nano-/microstructural investigations of the material performed during its preparation, we were able to identify TiZrN2 nanocrystals with a size as low as 9 nm distributed in α- and β-Si3N4 phases at a temperature as low as 1500 °C. We particularly proved that the TiZrN2 nanophase could be generated because of the use of the polysilazane evoluting towards a covalently-bonded Si3N4 matrix . This unique nanostructure is expected to provide particular functionality to Si3N4 as noble metal-free catalysts and components with high plasmonic quality.

Published
2022

8. A multiscale homogenization model on thermal conductivity of bio-based building composite considering anisotropy, imperfect interface and moisture

Author

Gang Huang, Ariane Abou-Chakra, Sandrine Geoffroy, Joseph Absi, Laboratoire Matériaux et Durabilité des constructions (LMDC), 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)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)

Subjects
[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, General Materials Science, Building and Construction, Civil and Structural Engineering
Abstract

International audience

Published
2023

9. Influence des solutions alcalines sur la tenue des géopolymères à haute température (1150 °C)

Author

Cligny, Quentin, Brandt, Damien, Rossignol, Sylvie, IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), CEA Le Ripault (CEA Le Ripault), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and IRCER

Subjects
[CHIM]Chemical Sciences
Published
2023

10. Modélisation discrète 3D de la microstructure de céramiques projetées plasma

Author

Longchamp, Vincent, Girardot, Jérémie, André, Damien, Malaise, Frédéric, Carles, Pierre, Iordanoff, Ivan, Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), CEA-CESTA (Le Barp, Gironde), and IRCER

Subjects
[CHIM]Chemical Sciences
Published
2023

11. Modélisation par éléments discrets du frittage de pièces céramiques réalisées par stéréolithographie

Author

Benjira, Aya, André, Damien, Antou, Guy, Belleville, Philippe, Laute, Clément, Maître, Alexandre, Rochais, Denis, IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), CEA Le Ripault (CEA Le Ripault), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and IRCER

Subjects
[CHIM]Chemical Sciences
Published
2023

12. Synthèse et mise en forme d’une nouvelle céramique tellurate : cas du grenat tellurate Ca3Zn3Te2O12 non dopé et dopé par les ions Ce3+

Author

Cholin, Marine, Guy, Graziella, Delaizir, Gaëlle, Boucle, Johann, Thomas, Philippe, Couderc, Vincent, Duclère, Jean-René, Chenu, Sébastien, IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), 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), and IRCER

Subjects
[CHIM]Chemical Sciences
Published
2023

13. La fabrication additive appliquée à l’élaboration de combustibles nucléaires innovants

Author

Lemarignier, Paul, Fiquet, Olivier, Pateloup, Vincent, Laboratoire des Combustibles Uranium (LCU), Service d'Analyses, d'Elaboration, d'Expérientations et d'Examens des combustibles (SA3E), Département d'Etudes des Combustibles (DEC), 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)-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)-Département d'Etudes des Combustibles (DEC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)

Subjects
[CHIM]Chemical Sciences
Published
2023

14. Self-assembled gel tubes, filaments and 3D-printing with in situ metal nanoparticle formation and enhanced stem cell growth

Author

Carmen C. Piras, Alasdair G. Kay, Paul G. Genever, Juliette Fitremann, David K. Smith, University of York [York, UK], Interactions moléculaires et réactivité chimique et photochimique (IMRCP), 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 Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), 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)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), IDeAS - Interfaces Dynamiques et Assemblages Stimulables (IDeAS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
education, [CHIM]Chemical Sciences, General Chemistry
Abstract

Simple fabrication and 3D-printing methods are used to generate tubes and filaments from self-assembled gels, which can be loaded in situ with gold nanoparticles, with the resulting gels encouraging stem cell proliferation.

Published
2022

15. Flow cytometry assay to evaluate lipid production by the marine microalga Tetraselmis sp. using a two stage process

Author

Hajer Ben Hlima, Imen Fendri, Slim Abdelkafi, Fatma Elleuch, Mouna Dammak, Chantal Pichon, Philippe Michaud, Unité de Biotechnologie des Algues, Biological Engineering Department, National School of Engineers of Sfax, Université de Sfax - University of Sfax, Laboratoire de Génie Enzymatique et Microbiologie, Equipe de Biotechnologie des Algues, National Engineering School of Sfax, University of Sfax, 3029 Sfax, Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), and Laboratoire de Biotechnologies des Plantes Appliquées à l’Amélioration des Plantes, Faculté des Sciences, Université de Sfax, Sfax 3038

Subjects
chemistry.chemical_classification, 060102 archaeology, biology, Strain (chemistry), medicine.diagnostic_test, Renewable Energy, Sustainability and the Environment, Chemistry, [SDV]Life Sciences [q-bio], 020209 energy, Biomass, Lipid metabolism, 06 humanities and the arts, 02 engineering and technology, biology.organism_classification, Flow cytometry, Biodiesel production, 0202 electrical engineering, electronic engineering, information engineering, medicine, 0601 history and archaeology, Food science, Autotroph, Tetraselmis, Carotenoid
Abstract

International audience; Tetraselmis sp. strain MD-01, a microalga isolated from the Tunisian marine coast, has been studied for autotrophic lipids production with two stage process. This strategy was conducted for maximum cells production under moderated conditions (2.12 g L−1), followed by cultivation under stressed conditions to induce lipid synthesis. High irradiance (300 μmol m−2 s−1) and nitrogen depletion (S mode) showed better carotenoids accumulation and lower chlorophylls content in microalgae compared to those obtained in biomass cultivated under high irradiance (Sg mode). This two-stage strategy allowed to increase of lipid content in cells cultivated in Sg and S modes from 18% DW (stage I) to 50 and 61.5% DW (stage II), respectively, with an increase of saturated and long chain fatty acids levels. Based on fluorometry analyses, an increase of lipids in Nile-Red stained cells and a decrease of chlorophylls auto-fluorescence under stressed conditions were shown. From spectral data, the lipids: amide I ratio obtained from S mode was 2.17 and 4.45 times higher than that from Sg mode and control conditions, respectively. These results revealed the potential of Tetraselmis strain MD-01 for biodiesel production.

Published
2021

16. Rheophysical study of dispersed alumina suspensions

Author

Florian Boutenel, Anne Aimable, Gilles Dusserre, Thierry Chartier, Thierry Cutard, Institut Clément Ader (ICA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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 National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), 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, General Chemical Engineering, Thermodynamics, 02 engineering and technology, Dispersion, Rheophysical classification, 021001 nanoscience & nanotechnology, Atomic packing factor, 01 natural sciences, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], 010305 fluids & plasmas, Condensed Matter::Soft Condensed Matter, Shear rate, Viscosity, Colloid, Rheology, Alumina suspensions, 0103 physical sciences, Maximum packing fraction, DLVO theory, 0210 nano-technology, Dispersion (chemistry), Dimensionless quantity
Abstract

International audience; This paper studies the rheological behavior of aqueous suspensions of fine grained (d50 = 200 nm) alumina. Rheological measurements were performed on suspensions containing various amounts of solid and 0.26 wt% of ammonium polymethacrylate in order to ensure a good state of dispersion. Brownian motions, colloidal interactions and hydrodynamic interactions dictate the behavior. The viscosity is mainly influenced by the shear rate and by the solid volume fraction. A Maron and Pierce model was used to describe this last effect in the hydrodynamic regime. The maximum packing fraction was found to be 40 vol%. This value is related to the colloidal stability as described by the DLVO theory. In fact, the maximum packing fraction leads to a surface-to-surface separation distance of about 46 nm because of the repulsive potential. Finally, a dimensionless approach was achieved to quantitatively identify, on the rheogram, the different flow regimes associated to each dominant interaction type.

Published
2021

17. Symmetric and asymmetric membranes based on La0.5Sr0.5Fe0.7Ga0.3O3-δ perovskite with high oxygen semipermeation flux performances and identification of the rate-determining step of oxygen transport

Author

Deronzier, Eva, Chartier, Thierry, Geffroy, Pierre-Marie, Geffroy, P.-M, IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
LSFGa5573 perovskite membrane, Work (thermodynamics), Materials science, Porous layer, Diffusion, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, Oxygen, 0103 physical sciences, Materials Chemistry, Perovskite (structure), 010302 applied physics, Oxygen diffusion, BSF55 coating, Oxygen transport, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Rate-determining step, Oxygen semipermeation, Membrane, chemistry, Chemical physics, Ceramics and Composites, Surface modification, 0210 nano-technology
Abstract

International audience; This work focuses on identifying the rate-determining step of oxygen transport through La0.5Sr0.5Fe0.7Ga0.3O3-δ membranes with symmetric and asymmetric architectures. The best oxygen semipermeation fluxes are 3.4 10−3 mol. m-2.s-1 and 6.3 10−3 mol. m-2.s-1 at 900 °C for the symmetric membrane and asymmetric membrane with a modified surface. The asymmetric membrane with a modified surface leads to an increase of approximately 7 times the oxygen flux compared to that obtained with the La0.5Sr0.5Fe0.7Ga0.3O3-δ dense membrane without surface modification. This work also shows that the oxygen flux is mainly governed by gaseous oxygen diffusion through the porous support of asymmetric La0.5Sr0.5Fe0.7Ga0.3O3-δ membranes.

Published
2021

18. Impact of bio-based binders on rheological properties of aqueous alumina slurries for tape casting

Author

Luc Picton, Thierry Chartier, Vincent Chaleix, Jérémy Marie, Julie Bourret, Marguerite Bienia, Agnès Smith, Pierre-Marie Geffroy, IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Tape casting, Molar mass, Materials science, food.ingredient, Pectin, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Petrochemical, food, Rheology, Chemical engineering, 0103 physical sciences, Ultimate tensile strength, Materials Chemistry, Ceramics and Composites, Slurry, 0210 nano-technology, Suspension (vehicle), ComputingMilieux_MISCELLANEOUS
Abstract

This work describes the preparation of concentrated alumina suspensions based on bio-sourced additives with a low environmental impact and with the rheological properties adapted to the tape casting process. Natural polysaccharides extracted from plants and fruits (pectin, psyllium…) were characterized (molar weight) and identified as promising binders for substituting the classical organic binders from petrochemical industry. The rheological behavior of the additives and of the suspensions containing these bio-sourced additives was studied in flow and in oscillations. The mechanical properties of the green tapes obtained with the different bio-sourced binders were determined from tensile experiment. This paper studies the relations between the nature of the binder, the rheological behavior of the suspension, the ability to tape cast the suspensions and the final properties of the green and sintered tapes.

Published
2021

19. Monitoring of the recovery of ion-damaged 4H-SiC with in-situ synchrotron X-ray diffraction as a tool for strain-engineering

Author

Anusmita Chakravorty, Alexandre Boulle, Aurélien Debelle, Isabelle Monnet, Gouranga Manna, Pinku Saha, Mrinmay Kumar Mukhopadhyay, Debdulal Kabiraj, Inter-University Accelerator Centre, 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Matériaux, Défauts et IRradiations (MADIR), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Chemistry and Physics of Materials Unit [Bangalore, India], and Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR)

Subjects
4H-SiC, Ion-irradiation, Mechanics of Materials, Mechanical Engineering, Thermal recovery, Synchrotron single-crystal XRD, General Materials Science, lattice damage, [CHIM.MATE]Chemical Sciences/Material chemistry, Strain-engineering
Abstract

International audience; In-situ thermal annealing (673-1273 K) during X-ray diffraction synchrotron measurements was performed to monitor the strain level as a proxy to follow the recovery of 300 keV Ar ion irradiated 4H-SiC single crystals. Results show that, when exposed to Ar ions at a fluence of 6.7 × 10 14 ions/cm 2 (0.7 dpa), the material suffers a maximum strain of 12% that reduces to 2% after the final anneal at 1273 K. In the same time, the disorder derived from the XRD data also demonstrates a thermal recovery of the crystalline structure. Hence, this work presents ion irradiation as a means to induce specific crystalline order and depth-controlled strain states within a few 100s of nm window in 4H-SiC.

Published
2022

20. Phase transition and twinning in polycrystals probed by in situ high temperature 3D reciprocal space mapping

Author

Ravi Raj Purohit Purushottam Raj Purohit, Daniel Pepin Fowan, Elsa Thune, Stephan Arnaud, Gilbert Chahine, Nils Blanc, Olivier Castelnau, René Guinebretière, Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), CRG & Grands instruments (NEEL - CRG), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Science et Ingénierie des Matériaux et Procédés (SIMaP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), and ANR-19-CE09-0035,HoTMiX,Comportement micromécanique à très haute température d'oxydes nanostructurés. Etude expérimentale et design de matériaux virtuels multiéchelle(2019)

Subjects
[SPI]Engineering Sciences [physics], Physics and Astronomy (miscellaneous), [CHIM.CRIS]Chemical Sciences/Cristallography, Cristallographie [Chimie], Sciences de l'ingénieur
Abstract

International audience; Polycrystalline materials exhibit physical properties that are driven by both the interatomic crystallographic structure as well as the nature and density of structural defects. Crystallographic evolutions driven by phase transitions and associated twinning process can be observed in situ in three-dimensional (3D) using monochromatic synchrotron radiation at very high temperatures (over 1000 C). This paper focuses on continuous measurements of the 3D-reciprocal space maps by high-resolution x-ray diffraction as a function of temperature along a phase transition process occurring between 1200 C and room temperature. These high precision measurements allow observing the reciprocal space node splitting and the evolution of the diffuse scattering signal around that node as a function of temperature. The capability of this experimental method is illustrated by direct in situ high temperature measurements of the 3D splitting of a reciprocal space node due to phase transition recorded on dense pure zirconia polycrystals.

Published
2022

21. Structural and electrical properties of high-performance vanadium dioxide thin layers obtained by reactive magnetron sputtering

Author

Eduard-Nicolae Sirjita, Alexandre Boulle, Jean-Christophe Orlianges, Richard Mayet, Aurelian Crunteanu, XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), This work benefited from government support managed by the National Research Agency under the Investments for the future program with the reference ANR-10-LABX-0074-01 Sigma-LIM. The authors acknowledge support from the PETACom FET Open H2020 grant number 829153 and the Femto-VO2 Project (Nouvelle-Aquitaine region)., ANR-10-LABX-0074,Sigma-LIM,From specific ceramic materials and components to integrated, secured and intelligent communication systems(2010), and European Project: 712590,H2020 FET Open 'Technologies futures et émergentes',829153,PETACom(2019)

Subjects
Vanadium Dioxide, Metal-insulator transition, Materials Chemistry, Metals and Alloys, Surfaces and Interfaces, [CHIM.MATE]Chemical Sciences/Material chemistry, Reactive magnetron sputtering, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Abstract

International audience; Epitaxial vanadium dioxide (VO2) films exhibiting an abrupt metal-insulator transition with resistivity ratios of five orders of magnitude have been grown on (001)-oriented sapphire substrates by reactive magnetron sputtering. The influence of deposition and annealing temperature on the structure and morphology of the layers are discussed as well as their impact on the films' electrical properties. Thus, the VO2 layers obtained using the optimal experimental conditions have electrical resistivity ratios over 10 5 and can be obtained on substrates as large as three-inch in diameter. The combination of the scalability of magnetron sputtering and the high quality of the films enables the large-scale industrial applications of high quality VO2 layers.

Published
2022

22. Fiber drawing ability and loss optimization of niobium rich borophosphate optical glass fibers

Author

Georges El Dib, Ronan Lebullenger, Laura Loi, Thierry Pain, Frédéric Adamietz, Lionel Canioni, Thierry Cardinal, Sebastien Chenu, Sylvain Danto, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-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 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), Centre d'Etudes Lasers Intenses et Applications (CELIA), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires (ISM), Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1 (UB)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and This work was supported by Agence Nationale de la Recherche (ANR) (ANR Grant 'TRAFIC' N°62243) and by the Région Nouvelle-Aquitaine (Grant 'F2MH' N°66245).

Subjects
Inorganic Chemistry, Organic Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Atomic and Molecular Physics, and Optics, Spectroscopy, Electronic, Optical and Magnetic Materials
Abstract

International audience; Here we explore the manufacturing of niobium-rich borophosphate glasses into fibers with optical quality. Glass preforms of composition [(100-x) (0.95 NaPO3 + 0.05 Na2B4O7) - x Nb2O5] with x = 37, 38, 39, 40 were synthetized and thermally drawn. Viscosity measurements performed in the softening point range show that the optical fiber drawing temperature gradually increases with the amount of niobium oxide. X-ray diffraction and Raman structural analysis performed post drawing demonstrate that the BPN glass with 39% Nb2O5 represents the upper limit for fiber drawing under oxygen. Subsequently, preform quenching protocol was optimized to mitigate the density fluctuations within the glass matrix related to convection flows and compare with the conventional cast-in-mold method. Optical transmission and shadowscopy imaging highlight the improvement in the optical quality of the glasses produced following this new protocol. This observation is confirmed by cut back loss measurements which show a decreasing in the attenuation from 6.04 dB/m to 3.19 dB/m between the two methods. One believes the manufacturing of niobium rich borophosphate fibers with improved optical quality highlights their potential to be used as near-infrared highly nonlinear waveguide devices.

Published
2022

23. The influence of pyrolysis temperature on the oxidation resistance of carbon-rich SiCN ceramics derived from reaction of silazanes with acrylonitrile

Author

Christel Gervais, Samuel Bernard, Ricardo Antonio Francisco Machado, Luiz Fernando Belchior Ribeiro, G. Motz, André Vinícius Andrade Bezerra, IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), 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), 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, Annealing (metallurgy), chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, Phase (matter), 0103 physical sciences, Materials Chemistry, Ceramic, Oxidation resistance, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Nanocomposite, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Chemical engineering, chemistry, visual_art, Ceramics and Composites, visual_art.visual_art_medium, Acrylonitrile, 0210 nano-technology, Carbon, Pyrolysis
Abstract

The influence of pyrolysis temperature on the oxidation resistance of carbon-rich SiCN ceramics derived from reaction of acrylonitrile with a commercially available oligosilazane (HTT1800) and its subsequent pyrolysis in nitrogen atmosphere was evaluated. The investigation of the oxidation behavior reveals that the final pyrolysis temperature plays an important role in the oxidation resistance of the developed SiCN/C nanocomposites. Increasing the pyrolysis temperature promotes an ordering of the free-carbon phase and consequently, an improvement of the oxidation resistance is noticed. However, starting phase separation during annealing at 1500 °C reduces slightly the protection effect provided by the oxidation resistant Si3N4 phase.

Published
2021

24. PROCESSING AND CHARACTERIZATION OF LOW-THERMAL CONDUCTIVITY, CLAY-BASED, CERAMIC MEMBRANES FOR FILTERING DRINKING WATER

Author

Mohamed Mouafon, Daniel Njopwouo, Gisèle Laure Lecomte-Nana, Dayirou Njoya, Nicolas Tessier-Doyen, André Njoya, Laboratory of Applied Inorganic Chemistry, Department of Inorganic Chemistry, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon, IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), and Université de Dschang

Subjects
Materials science, Starch, Soil Science, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, law.invention, chemistry.chemical_compound, Flexural strength, Geochemistry and Petrology, law, Earth and Planetary Sciences (miscellaneous), Ceramic, Turbidity, Porosity, ComputingMilieux_MISCELLANEOUS, Filtration, Water Science and Technology, Macropore, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 6. Clean water, 0104 chemical sciences, Membrane, chemistry, Chemical engineering, 13. Climate action, visual_art, visual_art.visual_art_medium, 0210 nano-technology
Abstract

Drinking-water supply remains a significant challenge in tropical areas; to help meet this challenge, the purpose of the present study was to manufacture low-thermal conductivity ceramic membranes suitable for the retention/removal of particles found in non-potable water. These membranes with significant chemical and mechanical resistances were developed from Cameroonian clays, cassava starch, and bovine bone ash. Up to 30% of Cassava starch and bovine bone ash were added to the membrane as porogens (materials used to make pores in membranes). Membranes were manufactured by uniaxial pressing, drying at 105°C, and sintering at 1150°C for 2 h. The effects of various types of porogen on the thermal behavior, microstructure, flexural strength, porosity, and permeability of ceramic membranes were investigated to determine possible applications of those membranes for water filtration in the tropics. The thermal conductivity of membranes produced without a pore-forming agent (SM0) was greater (0.54 Wm–1K–1) than those produced with starch (SM1 and SM3) (0.45–0.40 Wm–1K–1) or bovine bone ash (SM2) (0.49 Wm–1K–1). The total porosity of SM0s (30.72%) was less than those of starch and bovine bone membranes (37.87–45.99%). The average pore size (0.04 μm) of SM2 membranes was the smallest: SM0 (0.09 μm), SM1 (0.10 μm), and SM3 (0.07 μm). The maximum pore size was 0.37 μm, indicating that membranes contain mesopores and macropores. The flexural strengths of SM1 and SM3 membranes (8.85 and 6.97 MPa, respectively) were less than those of SM2 (10.53 MPa) and SM0 (10.28 MPa), and water permeability from 108 L/h·m2 bar to 2198 L/h·m2 bar. Filtered water properties showed that pH values were upgraded from 5.9 to 7, the turbidity reduction rates and levels were >94% and

Published
2021

25. Effect of energy deposition on the disordering kinetics in dual-ion beam irradiated single-crystalline GaAs

Author

A. Debelle, G. Gutierrez, A. Boulle, I. Monnet, L. Thomé, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Service de recherches de métallurgie physique (SRMP), Département des Matériaux pour le Nucléaire (DMN), 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, 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), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
General Physics and Astronomy, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

The damage induced in GaAs crystals irradiated with dual-ion beam (low-energy I2+ and high-energy Fe9+), producing simultaneous nuclear ( Sn) and electronic ( Se) energy depositions, was investigated using several characterization techniques. Analysis of the damage buildup shows that Sn alone (single 900 keV ion beam) leads, in a two-step process, to full amorphization of the irradiated layer (at a fluence of 1.5 nm−2) and to the development of a high (2.2%) elastic strain. Conversely, only one step in the disordering process is observed upon dual-ion beam irradiation (i.e., 900 keV I2+ and 27 MeV Fe9+, Sn& Se); hence, amorphization is prevented and the elastic strain remains very weak (below 0.2%). These results provide a strong evidence that, in GaAs, the electronic energy deposition can induce an efficient dynamic annealing of the damage created in collision cascades formed during nuclear energy deposition.

Published
2022

26. LaueNN: neural-network-based hkl recognition of Laue spots and its application to polycrystalline materials

Author

Ravi Raj Purohit Purushottam Raj Purohit, Samuel Tardif, Olivier Castelnau, Joel Eymery, René Guinebretière, Odile Robach, Taylan Ors, Jean-Sébastien Micha, Nanostructures et Rayonnement Synchrotron (NRS ), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Synthèse, Structure et Propriétés de Matériaux Fonctionnels (STEP ), SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé (SYMMES), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), ANR-19-CE09-0035,HoTMiX,Comportement micromécanique à très haute température d'oxydes nanostructurés. Etude expérimentale et design de matériaux virtuels multiéchelle(2019), Tardif, Samuel, and Comportement micromécanique à très haute température d'oxydes nanostructurés. Etude expérimentale et design de matériaux virtuels multiéchelle - - HoTMiX2019 - ANR-19-CE09-0035 - AAPG2019 - VALID

Subjects
General biochemistry, [SPI] Engineering Sciences [physics], Molecular biology, Genetics and Molecular Biology, Cristallographie [Chimie], neural networks, Sciences de l'ingénieur, [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], General Biochemistry, Genetics and Molecular Biology, X-ray, [SPI]Engineering Sciences [physics], Synchroton, synchrotron, General Biochemistry, hkl recognition, Genetics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Synchrotron X-ray Laue microdiffraction, X-ray Laue microdiffraction, Laue microdiffraction, Neural networks
Abstract

A feed-forward neural-network-based model is presented to index, in real time, the diffraction spots recorded during synchrotron X-ray Laue microdiffraction experiments. Data dimensionality reduction is applied to extract physical 1D features from the 2D X-ray diffraction Laue images, thereby making it possible to train a neural network on the fly for any crystal system. The capabilities of the LaueNN model are illustrated through three examples: a two-phase nanostructure, a textured high-symmetry specimen deformed in situ and a polycrystalline low-symmetry material. This work provides a novel way to efficiently index Laue spots in simple and complex recorded images in

Published
2022

27. Effect of temperature and clay addition on the thermal behavior of phosphate sludge

Author

A. Smith, A. Abourriche, Abdelaziz Benhammou, Youssef El Hafiane, Younes Abouliatim, Mohamed Amine Harech, Mohamed Mesnaoui, L. Nibou, IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), 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, Dolomite, Clay industries. Ceramics. Glass, 02 engineering and technology, engineering.material, 010502 geochemistry & geophysics, Anorthite, 01 natural sciences, Industrial and Manufacturing Engineering, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, Tratamiento térmico, Kaolinite, Monticellite, Francolite, ComputingMilieux_MISCELLANEOUS, Arcilla de Safi, 0105 earth and related environmental sciences, Calcite, Fluorapatite, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Transformaciones mineralógicas, TP785-869, chemistry, Chemical engineering, Mechanics of Materials, Illite, Ceramics and Composites, engineering, Lodos de fosfato, 0210 nano-technology
Abstract

The aim of the present work is to characterize the phosphate sludge from the area of Youssoufia (rich in CaO ~ 31%) and to study its thermal behavior alone and when mixed with clay from Safi (Morocco). This may contribute to its valorization as an alternative raw material for ceramic industries. The evolution of phases during the thermal treatment of phosphate sludge, clay and sludge–clay mixtures at different mass ratios (25 wt%, 50 wt%, and 75 wt%) was performed at different levels of temperatures from 600 to 1120 °C. Mineralogical analysis by X-ray diffraction (XRD) showed that the sludge mainly consisted of quartz, calcite, dolomite, and francolite. Dolomite and calcite vanished after sludge heating and two new phases were formed, namely akermanite and monticellite. For clay, it mainly consisted of illite, kaolinite, quartz, calcite, and dolomite. After clay sintering at high temperature, a new phase was formed, i.e. anorthite. The effects of the MO/SiO2 ratio (MO = CaO + MgO) in mixtures (clay + sludge) on the crystallization behavior of diopside and fluorapatite, and the disappearance of the akermanite were investigated. The results showed that the crystallization of diopside–fluorapatite increased when the MO/SiO2 ratio increased. Resumen: El objetivo del presente trabajo es caracterizar un lodo de fosfato del área de Youssoufia (rico en CaO ~ 31%) y estudiar su comportamiento térmico tras su mezcla con una arcilla de Safi (Marruecos). Este estudio puede contribuir a su valorización como materia prima alternativa para la industria cerámica. La evolución de las fases minerales durante el tratamiento térmico de lodos de fosfato, arcilla y mezclas de lodos y arcilla en diferentes proporciones de masa (25, 50 y 75% de peso) se realizó a diferentes temperaturas, desde 600 a 1.120 °C. El análisis por difracción de rayos X (DRX) permitió conocer la composición mineralógica del lodo formado principalmente por cuarzo, calcita, dolomita y francolita. La dolomita y la calcita desaparecieron tras el calentamiento del lodo y se formaron 2 nuevas fases, a saber, akermanita y monticellita. En cuanto a la arcilla, el análisis mineralógico evideció la presencia de illita, caolinita, cuarzo, calcita y dolomita como fases mayoritarias. Tras la descomposicón de la arcilla se formó anortita como fase de alta temperatura. Se investigaron los efectos de la relación MO/SiO2 (MO = CaO + MgO) en mezclas (arcilla + lodo) sobre la cristalización de diópsido y fluorapatita y la desaparición de la akermanita. Los resultados mostraron que la cristalización de diopsido-fluorapatita aumentó cuando creció el cociente MO/SiO2.

Published
2021

28. Chemical stability and oxygen transport properties of La1−xCaxFe1−yByO3−δ (with B = Co, Ni, Mg) perovskite membranes

Author

Isao Kagomiya, Yuki Yamaguchi, Yasunobu Mizutani, Yusuke Ogura, Pierre-Marie Geffroy, Shintaro Minami, Nagoya Institute of Technology (NIT), IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), National Institute of Advanced Industrial Science and Technology (AIST), and Technical Research Institute of JSPMI(Japan Society for the Promotion of Machine Industry)

Subjects
inorganic chemicals, Materials science, Oxide, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, Oxygen, [SPI.MAT]Engineering Sciences [physics]/Materials, Oxygen permeability, chemistry.chemical_compound, 0103 physical sciences, General Materials Science, ComputingMilieux_MISCELLANEOUS, Perovskite (structure), 010302 applied physics, Mechanical Engineering, technology, industry, and agriculture, Oxygen transport, [CHIM.MATE]Chemical Sciences/Material chemistry, Partial pressure, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Membrane, chemistry, Chemical engineering, Mechanics of Materials, Chemical stability, 0210 nano-technology, human activities
Abstract

The mixed conductive perovskite La1−xCaxFeO3−δ (LCF) exhibits high oxygen permeability. For further improvement of the oxygen permeability as well as the chemical stability, this study investigates the impact of the doping elements on the perovskite B-site. The cobalt (Co) doping of the LCF improved both the oxygen diffusion and the oxygen surface exchange. However, the oxygen semi-permeation flux of the Co-doped LCF sample was not stable at high temperatures under the high oxygen partial pressure difference (air/argon). The magnesium (Mg) doping in the B-site significantly improved the chemical stability of the LCF membranes, with the oxygen semi-permeation performances close to those obtained with the Co-doped LCF membranes. Thus, the Mg-doped LCF presented the best compromise between chemical stability and oxygen semi-permeation performance, which is applicable to the oxygen transport membranes or the cathodes in solid oxide fuel cells.

Published
2021

29. Chemical and Mechanical Characterisation of White Earthenware Glazes from the Johnston‐Vieillard Manufactory (France, 19th Century)

Author

Quentin Lemasson, Emmie Beauvoit, Camille Frugier, Ayed Ben Amara, Nicolas Tessier-Doyen, Rémy Chapoulie, Bernard Gratuze, Laurent Pichon, Claire Pacheco, Brice Moignard, IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), IRAMAT - Centre Ernest Babelon (IRAMAT-CEB), Institut de Recherches sur les Archéomatériaux (IRAMAT), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)

Subjects
Archeology, History, White (horse), 060102 archaeology, media_common.quotation_subject, [CHIM.MATE]Chemical Sciences/Material chemistry, 06 humanities and the arts, 02 engineering and technology, Art, 021001 nanoscience & nanotechnology, Archaeology, [SPI.MAT]Engineering Sciences [physics]/Materials, La icp ms, 0601 history and archaeology, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, media_common
Abstract

International audience

Published
2021

30. Investigations on Particle Behavior at the Stagnation Zone for a Suspension Particle Jet in Plasma Spray Conditions

Author

Michel Vardelle, Pierre-Marie Geffroy, Simon Goutier, Alice Dolmaire, Aurélien Joulia, 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), IRCER - Axe 2 : procédés plasmas et lasers (IRCER-AXE2), 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), and IRCER - Axe 1 : procédés céramiques (IRCER-AXE1)

Subjects
010302 applied physics, Jet (fluid), Materials science, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, Mechanics, Velocimetry, Condensed Matter Physics, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Surfaces, Coatings and Films, Suspension (chemistry), 020303 mechanical engineering & transports, 0203 mechanical engineering, Particle image velocimetry, 0103 physical sciences, Materials Chemistry, Suspension plasma spray, Particle, Particle velocity, Thermal spraying, ComputingMilieux_MISCELLANEOUS
Abstract

The suspension plasma spray process is now emerging at the industrial scale, and open questions remain regarding the formation of coatings through this process, especially regarding the relationship among particle impact, spreading and build-up into columns. Furthermore, concerns have been raised regarding the behavior of the suspension droplets in the plasma jet stagnation zone since it is a zone where plasma jet streamline directions and velocities are highly disrupted when the plasma jet impinges on a solid surface. In this study, the particle-laden jet streamlines were experimentally observed very closely to a flat surface using a particle image velocimetry technique. Submicron particles were collected in flight to determine which particles contributed to coating growth. The particle mean impact velocity against the surface was determined through image velocimetry and splat dimensions. The impact angles of the particles were also determined, and a correlation was identified with the growth angles of the columnar coating.

Published
2021

31. The effect of oxygen partial pressure on dislocation creep in polycrystalline uranium dioxide

Author

Xavière Iltis, Jean-Baptiste Parise, Thomas Helfer, Philippe Garcia, Guy Antou, Audrey Miard, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), 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), Département d'Etudes des Combustibles (DEC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
010302 applied physics, Dislocation creep, Materials science, Uranium dioxide, Thermodynamics, chemistry.chemical_element, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, Partial pressure, Strain hardening exponent, 021001 nanoscience & nanotechnology, 01 natural sciences, Oxygen, [SPI.MAT]Engineering Sciences [physics]/Materials, Stress (mechanics), chemistry.chemical_compound, Creep, chemistry, Finite strain theory, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

We report a set of compression test experiments carried out on sintered uranium dioxide at 1500 ° C, at constant strain rates and under controlled oxygen partial pressures. The macroscopic data indicate an initial strain hardening stage followed by a quasi steady-state period during which changes in the stress level are sluggish. The data are further interpreted in a continuum mechanics, finite strain framework, in both one and two-dimensional geometries, whence stress and oxygen partial pressure exponents of the creep law are estimated. The stress exponent is indicative of power-law creep. The oxygen partial pressure exponent is consistent with a strain-rate limited by vacancy mediated self-diffusion of the slowest moving ion, suggesting a climb-controlled recovery process. Some samples are further characterized using SEM/EBSD which reveals signs of plastic deformation typical of recovery creep. The effect of oxygen pressure upon microstructure is discussed.

Published
2021

32. Transparent ceramics green-microstructure optimization by pressure slip-casting: Cases of YAG and MgAl2O4

Author

Christian Sallé, Rémy Boulesteix, Alexandre Maitre, Christophe Coureau, Camille Perrière, Adrian Goldstein, Mickael Katz, IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), 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), SOLCERA, and Compagnie industrielle des lasers (CILAS)

Subjects
010302 applied physics, Pressing, Fabrication, Materials science, Transparent ceramics, Spinel, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, Slip (ceramics), [SPI.MAT]Engineering Sciences [physics]/Materials, Hot isostatic pressing, visual_art, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, engineering, Composite material, 0210 nano-technology, Porosity, ComputingMilieux_MISCELLANEOUS
Abstract

This paper presents experimental data and its interpretation regarding the forming of YAG and spinel green-bodies, intended for transparent parts fabrication, by the pressure slip casting (PSC) method. Conditions for an optimal operation are established based on the modeling of the filtration kinetics. It emerges that the method is able to provide highly sinterable green parts by ensuring that the cakes porosity exhibits low average size and narrow size distribution. Results were compared with other popular forming approaches like slip casting (SC) and cold isostatic pressing (CIP). PSC was found as superior, to the other approaches, as far as obtainment of high sinterability green- bodies is concerned. In the case of YAG, it was shown that PSC method even allows the replacement of the traditional long vacuum firings by a two stage densification operation in which an initial air-firing is completed by a hot isostatic pressing step.

Published
2021

33. Densification behaviour and three-dimensional printing of Y2O3 ceramic powder by selective laser sintering

Author

F. Francqui, Nicolas Tessier-Doyen, Naveen Mani Tripathi, A. Zerrouki, P. Duport, Damien André, Gaëlle Delaizir, A. Neveu, Benoît Nait-Ali, A. Ratsimba, Centre Européen de la Céramique, Ecole Nationale Supérieure de Céramique Industrielle (ENSCI), IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), and IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3)

Subjects
Materials science, Scanning electron microscope, Sintering, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, law.invention, law, 0103 physical sciences, Materials Chemistry, Ceramic, Laser power scaling, Composite material, ComputingMilieux_MISCELLANEOUS, Yttria-stabilized zirconia, 010302 applied physics, Process Chemistry and Technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Selective laser sintering, visual_art, Volume fraction, Ceramics and Composites, visual_art.visual_art_medium, Particle, 0210 nano-technology
Abstract

The selective laser sintering (SLS) of an yttria (Y2O3) ceramic powder was studied to understand both the effects of i) the initial yttria particle characteristics on the powder bed behaviour and ii) the process conditions (laser power, scanning speed, hatching space) on the sintering/melting of three-dimensionally printed objects. The roughness of the powder bed, a sensitive indicator of the layer bed quality, was determined through three-dimensional optical profilometry and the powder bed packing density was modelled using the discrete-element method. Complex shaped objects including spheres and open rings were successfully fabricated by the SLS three-dimensional printing. In addition, SLS cube-shaped samples were characterized by X-ray diffraction and scanning electron microscopy. The open pore volume fraction significantly decreased from 41% without a post-SLS heat treatment to 31% with a post-SLS heat treatment at 1750 °C for 20 h under secondary vacuum. Finally, an anisotropy in elastic properties has been highlighted, Young's modulus reaches 11 GPa in the stiffest direction.

Published
2021

34. Cationic Order–Disorder in Double Scheelite Type Oxides: the Case Study of Fergusonite La2SiMoO8

Author

Sandrine Coste, Maud Barré, Emmanuelle Suard, Antoine Pautonnier, Emilie Béchade, Philippe Lacorre, Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), 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 Laue-Langevin (ILL), and ILL

Subjects
Diffraction, Granular materials, Physical and chemical processes, 010405 organic chemistry, Chemistry, Crystal chemistry, Neutron diffraction, Stacking, [CHIM.MATE]Chemical Sciences/Material chemistry, Crystal structure, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, Fergusonite, 01 natural sciences, 0104 chemical sciences, Inorganic Chemistry, Crystallography, chemistry.chemical_compound, Chemical structure, Cations, Scheelite, Phase (matter), Physical and Theoretical Chemistry, Layers
Abstract

International audience; Up to now, the possible occurrence of a cationic ordering on the tetrahedral sublattices of stoichiometric double scheelite-type oxides was not settled, with somewhat contradictory X-ray diffraction and optical measurements [Blasse, G. J. Inorg. Nucl. Chem. 1968, 30, 2091]. Using two different synthesis routes, both ordered and disordered forms of fergusonite La2SiMoO8 were prepared. The crystal structure of the ordered form was determined using powder X-ray and neutron diffraction, which clearly evidence a tridimensional ordering between [SiO4] and [MoO4] tetrahedra. The crystal chemistry of ordered double sheelite-type LaIII2(SiIVO4)(MoVIO4) can be seen as an intermediate between those of simple regular scheelite or fergusonite LnIII(NbVO4) and of ordered triple scheelite BiIII3(FeIIIO4)(MoVIO4)2. The structure of the disordered La2SiMoO8 phase was analyzed using powder X-ray diffraction. A few small and larger diffraction peaks or bumps are observed in addition to the sharper peaks of a simple fergusonite cell. DIFFaX and FAULTS programs helped showing that these faint peaks originate from stacking faults between 2D ordered layers. The intermediate 2D–3D nature of SiO4/MoO4 ordering in seemingly disordered compounds might explain the previous discrepancy between optical and X-ray diffraction measurements.

Published
2021

35. First principles investigations of the optical selectivity of titanium carbide-based materials for concentrating solar power applications

Author

Won June Kim, Adel Mesbah, Samuel Bernard, Xavier Deschanels, Sébastien Lebègue, Laboratoire de Physique et Chimie Théoriques (LPCT), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), IRCELYON-C'Durable (CDURABLE), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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 ANR-16-CE08-0026,CARAPASS,NANOCOMPOSITES CARBURES ET CARBONITRURES COMME MATERIAUX SELECTIFS POUR LA CONVERSION PHOTOTHERMIQUE(2016)

Subjects
Materials science, chemistry.chemical_element, 02 engineering and technology, Dielectric, 01 natural sciences, 7. Clean energy, chemistry.chemical_compound, Impurity, 0103 physical sciences, Materials Chemistry, Silicon carbide, Ceramic, Boron, 010302 applied physics, Titanium carbide, Nanocomposite, business.industry, [CHIM.CATA]Chemical Sciences/Catalysis, General Chemistry, 021001 nanoscience & nanotechnology, Solar energy, [SDE.ES]Environmental Sciences/Environmental and Society, chemistry, visual_art, visual_art.visual_art_medium, Optoelectronics, 0210 nano-technology, business
Abstract

To improve the efficiency of concentrated solar power devices and to reach a high conversion rate of the solar energy into heat, a rational design of new high temperature absorber materials is a challenge of prime importance. Ultra-high temperature ceramics can fit the requirements to act as absorber materials, provided that their chemical composition and their properties are finely tuned. Within this context, we investigated the optical selectivity of titanium carbide modified with B, N, O impurity atoms or carbon vacancies, by first principles simulations. By computing the dielectric function and the reflectivity spectra of each composition, we found that modifying TiC can have important consequence on the optical properties of the bulk material, leading in certain cases to an enhancement of the optical selectivity. Then, we assess the performance of nanocomposites made of the corresponding nanoparticles embedded in a silicon carbide media by using Mie scattering theory fed by our ab initio dielectric functions. In this case, we found that while carbon vacancies are detrimental to selectivity, alloying TiC with boron improves notably the performance of the composite material, with an increase in selectivity of about 50%.

Published
2021

36. Comparison of sintering behavior and reinforcing mechanisms between 3Y-TZP/Al2O3(w) and 12Ce-TZP/Al2O3(w) composites: Combined effects of lanthanide stabilizer and Al2O3 whisker length

Author

Víctor Valcárcel-Juárez, Guanglin Nie, Kevin P. Plucknett, Peng-Jie Zhang, Alexandre Maitre, Bei-Bei Jiang, Yuan Lijuan, Zhao-Liang Guo, Luo Ruixin, Hua-Tay Lin, Meng Fan, Fei Zuo, School of Electromechanical Engineering [Guangzhou], Guangdong University of Science and Technology (GUST), Universidade de Santiago de Compostela [Spain] (USC ), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), 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), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Lanthanide, Materials science, Whiskers, Sintering, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Grain growth, Whisker, Diffusionless transformation, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Composite material, 0210 nano-technology, Reinforcement, ComputingMilieux_MISCELLANEOUS, Strengthening mechanisms of materials
Abstract

The densification behavior, microstructural development, toughening and strengthening mechanisms of Al2O3 whisker-reinforced 3Y-TZP and 12Ce-TZP composites were systematically and comparatively investigated with varying whisker lengths. Compared with 3Y-TZP/Aw composites, the presence of a Ce-Al-Si-O amorphous phase, caused by the addition of Al2O3 whiskers, promoted the densification and grain growth of 12Ce-TZP/Aw composites. Crack deflection and bridging are proposed as the primary toughening mechanisms for 3Y-TZP/Aw composites, while the t-m martensitic transformation would dominate the toughening and strengthening processes of 12Ce-TZP/Aw composites. Changes in Al2O3 whisker length would vary the distributions of internal stress and amorphous phase within the ceria-stabilized ZrO2 matrix, and hence affect the toughening and strengthening results. It indicates that effective toughening and strengthening of the Al2O3 whisker-reinforced TZP composites can be achieved by taking advantage of collaborative engineering control on the reinforcement morphology and the interface chemistry/structure.

Published
2021

37. Shaping of ceria-based single solid oxide cells combining tape-casting, screen-printing and infiltration

Author

Thierry Chartier, Pierre-Marie Geffroy, L. Guesnet, J.-C. Grenier, Jean-Marc Bassat, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-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), This research was partly supported by a French regional fellowship 'Région Nouvelle Aquitaine' (for L.G.). LG, JCG and JMB are grateful for the financial support obtained through the ANR project ECOREVE (ANR-18-CE05-0036-01). All authors acknowledge the French group GDR HysPac for fruitful discussions. Finally, the authors are grateful to the Solvay company (France) for providing the chemical precursors and powders employed in this work., and ANR-18-CE05-0036,ECOREVE,EleCtrOdes architecturées pour la Réalisation d'Electrolyseurs de la Vapeur d'Eau à haute température(2018)

Subjects
Materials science, Oxide, 02 engineering and technology, Electrolyte, 01 natural sciences, Catalysis, Solid Oxide Cells, chemistry.chemical_compound, Ceria, 0103 physical sciences, tape casting, Materials Chemistry, medicine, Porosity, 010302 applied physics, Tape casting, Pressing, infiltration method, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, medicine.disease, Chemical engineering, chemistry, Screen printing, Ceramics and Composites, 0210 nano-technology, Infiltration (medical)
Abstract

International audience; This study describes the development of a shaping process involving GDC10 (Ce0.9Gd0.1O1.95) as an electrolyte for Solid Oxide Cells operating at low temperature (500−600 °C). The goal is to build a single cell of porous/dense/porous GDC10 layers while adapting the porous layer thicknesses, which are infiltrated by catalysts to prepare efficient GDC-base composites. Two shaping processes were used to make the cell. The first process is die pressing of the electrolyte powder followed by the infiltration of a screen-printed porous backbone. The second shaping process consists of preparing a porous/dense/porous (30 μm/≈ 400 μm/30 μm) cell in a single step by combining tape-casting and screen-printing processes followed by the infiltration of the previous catalyst.

Published
2020

38. Caractérisation et localisation de l'endommagement dans les matériaux sous contrainte thermique : application de l'émission acoustique

Author

Bonzoms, Florian, Reoyo-Prats, Reine, Faugeroux, Olivier, Thil, Stéphane, Proust, Alain, Chotard, Thierry, Procédés, Matériaux et Energie Solaire (PROMES), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), MISTRAS Group, 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), Société Française de Thermique, and European Project: 228296,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2008-1,SFERA(2009)

Subjects
[SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2022

39. Principal component analysis for microwave and millimeter wave computational imaging

Author

Thomas Fromenteze, Okan Yurduseven, Philipp del Hougne, David R. Smith, Laboratoire d'Excellence Sigma-Lim 'Des matériaux et composants céramiques spécifiques aux systèmes communicants intégrés, sécurisés, et intelligents' [Labex] (Labex ∑-lim), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-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 des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institute of Electronics, Communications and Information Technology (ECIT), Institut d'Électronique et des Technologies du numéRique (IETR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Duke University [Durham], ANR JCJC Metamorph [ANR-21-CE42-0005], Leverhulme Trust [RL-2019-019], and ANR-21-CE42-0005,MetaMorph,Génération morphogénétique de composants électromagnétiques(2021)

Subjects
[SPI]Engineering Sciences [physics], principal component analysis, model reduction, frequency diverse imaging, Computational imaging
Abstract

International audience; The development of new imaging systems based on computational techniques greatly alleviate the hardware constraints usually encountered in these domains. The limitations associated with the use of highly redundant active chains are thus substituted by the development of radiating systems allowing the transfer of these limitations to the software layer. Faced with the large volumes of data to be processed, it is still necessary to propose numerical techniques to limit the size of the problems to be solved while ensuring that the imaging results remain exploitable for the targeted applications. Principal component analysis offers interesting insights in such a context.

Published
2022

40. Coherent anti-Stokes Raman scattering cell imaging and segmentation with unsupervised data analysis

Author

Damien Boildieu, Tiffany Guerenne-Del Ben, Ludovic Duponchel, Vincent Sol, Jean-Michel Petit, Éric Champion, Hideaki Kano, David Helbert, Amandine Magnaudeix, Philippe Leproux, Philippe Carré, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Synthèse et analyse d'images (XLIM-ASALI), Université de Poitiers, PEIRENE (PEIRENE), Institut Génomique, Environnement, Immunité, Santé, Thérapeutique (GEIST), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 (LASIRE), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), Institut de Recherche sur les CERamiques (IRCER), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Matériaux Procédés Environnement Ouvrages (IMPEO), Kyushu University, Université de Poitiers - Faculté de Sciences fondamentales et appliquées, and Labex Sigma-Lim

Subjects
Cell imaging, Coherent Raman imaging, Supercontinuum (SC), TrkB, Unsupervised data analysis, Vibrational microspectroscopy, Mitosis, Cell Biology, Chemometrics analysis, [SDV.BC]Life Sciences [q-bio]/Cellular Biology, multivariate curve resolution, CARS (Coherent Anti-Stokes Raman Scattering), C2C12 (mouse skeletal myoblasts), [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Cell segmentation, HEK 293 cell line, BDNF (brain-derived neurotrophic factor), Interphase, label-free imaging, Developmental Biology
Abstract

International audience; Coherent Raman imaging has been extensively applied to live-cell imaging in the last two decades, allowing to probe the intracellular lipid, protein, nucleic acid and water content with high acquisition rate and sensitivity. In this context, multiplex coherent anti-Stokes Raman scattering (MCARS) microspectroscopy using sub-nanosecond laser pulses is now recognized as a mature and straightforward technology for label-free bioimaging, offering the high spectral resolution of conventional Raman spectroscopy with reduced acquisition time. Here we introduce the combination of MCARS imaging technique with unsupervised data analysis based on multivariate curve resolution (MCR). The MCR process is implemented under the classical signal non-negativity constraint and, even more originally, under a new spatial constraint based on cell segmentation. We thus introduce a new methodology for hyperspectral cell imaging and segmentation, based on a simple, unsupervised workflow without any spectrum-to-spectrum phase retrieval computation. We first assess the robustness of our approach by considering cells of different types, namely from the human HEK293 and murine C2C12 lines. To evaluate its applicability over a broader range, we then study HEK293 cells in different physiological states and experimental situations. Specifically, we compare an interphasic cell with a mitotic (prophase) one. We also present a comparison between a fixed cell and a living cell, in order to visualize the potential changes induced by the fixation protocol in cellular architecture. Next, with the aim of assessing more precisely the sensitivity of our approach, we study HEK293 living cells overexpressing tropomyosin-related kinase B (TrkB), a cancer-related membrane receptor, depending on the presence of its ligand, brain-derived neurotrophic factor (BDNF). Finally, the segmentation capability of the approach is evaluated in the case of a single cell and, as well, by considering cell clusters of various sizes.

Published
2022

41. Computational diffraction reveals long-range strains, distortions and disorder in molecular dynamics simulations of irradiated single crystals

Author

A. Boulle, A. Chartier, A. Debelle, X. Jin, J.-P. Crocombette, 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), 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, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Lab JANNUS, Service de recherches de métallurgie physique (SRMP), Département des Matériaux pour le Nucléaire (DMN), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département des Matériaux pour le Nucléaire (DMN)

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry, General Biochemistry, Genetics and Molecular Biology
Abstract

Atomic-scale simulations, and in particular molecular dynamics (MD), are key assets to model the behavior of the structure of materials under the action of external stimuli, say temperature, strain or stress, irradiation, etc. Despite the widespread use of MD in condensed matter science, some basic material characteristics remain difficult to determine. This is, for instance, the case for the long-range strain tensor, and its root-mean-squared fluctuations, in disordered materials. In this work, computational diffraction is introduced as a fast and reliable structural characterization tool of atomic-scale simulation cells in the case of irradiated single crystals. In contrast to direct-space methods, computational diffraction operates in the reciprocal space and is therefore highly sensitive to long-range spatial correlations. With the example of irradiated UO2 single crystals, it is demonstrated that the normal strains, shear strains and rotations, as well as their root-mean-squared fluctuations (microstrain) and the atomic disorder, are straightforwardly and unambiguously determined. The methodology presented here has been developed with efficiency in mind, in order to be able to provide simple and reliable characterizations either operating in real time, in parallel with other analysis tools, or operating on very large data sets.

Published
2022

42. High-purity synthesis of La2SiO5 by solid-state reaction between La2O3 and different characteristics of SiO2

Author

Koichiro Fukuda, Anne Aimable, Lizeth Arbelaez, Emilie Béchade, Pierre-Marie Geffroy, IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), and IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3)

Subjects
Reaction mechanism, Materials science, Morphology (linguistics), Solid-state, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, Lanthanum oxide, 0103 physical sciences, Thermal, Materials Chemistry, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Process Chemistry and Technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Amorphous solid, Process conditions, chemistry, Chemical engineering, Ceramics and Composites, Particle, 0210 nano-technology
Abstract

The solid-state reaction between lanthanum oxide and different characteristics of silica has been investigated to define new process conditions that favor the formation of La2SiO5 and to characterize the La2O3: SiO2 reaction mechanisms. Silica with different crystalline structures (amorphous or quartz-type silica) and various average particle sizes of ~36, 12, 1, and 0.02 μm were used. The 1:1 M ratio mixtures between La2O3 and different types of SiO2 were ground and subsequently heated at 1200 and 1500 °C for 10 h. The morphology of the ground mixtures, their thermal properties, and the phases obtained after heating were determined in this study. The phases identified after each solid-state synthesis were quantified using Rietveld refinements. The results obtained indicate that an amorphous silica with a small particle size (

Published
2020

43. New KNbTeO6 transparent tellurate ceramics

Author

Sébastien Chenu, Morgane Dolhen, Damien Passerieux, Gaëlle Delaizir, Olivier Tantot, Jean-René Duclere, Nicolas Tessier-Doyen, Philippe Thomas, Pierre-Eugène Coulon, Julie Carreaud, Marion Vandenhende, Mathieu Allix, XLIM (XLIM), Université de Limoges (UNILIM)-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), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), and Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO)

Subjects
010302 applied physics, Materials science, Sintering, Spark plasma sintering, Green body, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, Dielectric, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, visual_art, 0103 physical sciences, [CHIM.CRIS]Chemical Sciences/Cristallography, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Transmittance, [CHIM]Chemical Sciences, Ceramic, Crystallite, Composite material, 0210 nano-technology
Abstract

International audience; New transparent defect pyrochlore KNbTeO 6 ceramics were successfully prepared by Spark Plasma Sintering (SPS) of same composition polycrystalline powders elaborated by classic solid-state reaction from oxide precursors (K 2 CO 3 , Nb 2 O 5 , TeO 2) and followed by high energy milling powders. As such precursors are not available as commercial nanopowders, a suitable process has been developed by combining solid-state reactions and high energy milling. The determination of appropriate consolidation conditions and sintering parameters of the green body such prepared, are described in this paper. The resulting ceramic is transparent in both the visible and near infrared range (up to 5.5 μm). The maximum of transmittance is reached in the near infrared region around 2500 nm with a value of 78 % (1 mm thick sample), close to the maximum theoretical value of transmittance. This transparent KNbTeO 6 ceramic demonstrates a homogeneous and dense microstructure with an average grain size less than 500 nm. A small content of secondary phase has been detected by nanoscale observations without drastic effects on transparency. This ceramic exhibits very good mechanical properties similar to the Y 2 O 3 transparent ceramic, as well as interesting dielectric properties in the microwave range. This innovative method should drive the development of new transparent materials with technologically relevant applications.

Published
2020

44. Oxygen semi-permeation properties of La1−xSrxFeO3−δ perovskite membranes under high oxygen gradient

Author

Thierry Chartier, Eva Deronzier, Pierre-Marie Geffroy, IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), 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, Mechanical Engineering, Oxygen transport, Analytical chemistry, chemistry.chemical_element, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, Permeation, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electrochemistry, 01 natural sciences, Oxygen, [SPI.MAT]Engineering Sciences [physics]/Materials, 0104 chemical sciences, Membrane, chemistry, Mechanics of Materials, Desorption, General Materials Science, 0210 nano-technology, Cobalt, Perovskite (structure)
Abstract

International audience; This work is focused on the evaluation of oxygen semi-permeation and electrochemical performances under high oxygen gradient of free cobalt perovskite membrane materials; La 1− x Sr x FeO 3−δ perovskite. For a better understanding of oxygen transport through La 1− x Sr x FeO 3−δ perovskite membranes, the oxygen diffusion, oxygen incorporation, and desorption coefficients were determined under high oxygen gradient in relation to the temperature for La 1− x Sr x FeO 3−δ (with x = 0.1, 0.3, 0.5, and 0.7) by a specific method based on oxygen semi-permeation. The best electrochemical performances were obtained for La 0.3 Sr 0.7 FeO 3−δ (LSF37) and La 0.5 Sr 0.5 FeO 3−δ (LSF55) perovskite membranes with oxygen fluxes of 1.7 × 10 −3 and 1.2 × 10 −3 mol/m 2 s at 900 °C, respectively. The oxygen incorporation and desorption coefficients of LSF55 were two times lower than those of LSF37 and similar to those of La 0.5 Sr 0.5 Fe 0.7 Ga 0.3 O 3−δ . The values of these coefficients are discussed and compared with the data reported in the literature by isotopic exchange for the similar material compositions.

Published
2020

45. Rupture of alumina coatings on C35 steel: A numerical simulation

Author

Raphaëlle Bernardie, Pierre Lefort, Reda Berkouch, Joseph Absi, Stéphane Valette, IRCER - Axe 2 : procédés plasmas et lasers (IRCER-AXE2), 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), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Materials science, Computer simulation, Mechanical Engineering, Fracture mechanics, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Finite element method, [SPI.MAT]Engineering Sciences [physics]/Materials, Mechanism (engineering), 0103 physical sciences, General Materials Science, Composite material, 0210 nano-technology
Abstract

The knowledge of the rupture mechanism of multilayer systems is necessary for improving the bonding of materials, particularly for the ceramic-to-metal junctions, and especially in the case of the ceramic coatings on metallic substrates. For this purpose, coupling experimental measurements of macroscopic interfacial adhesions with numerical tools of fracture mechanics allow understanding how the stress distribution and the cracking mechanisms are influenced by the local environment. This brings an explanation to the cracks initiation and propagation and to the role of local characteristics of the interfacial zone. The present work illustrates this, in the case of alumina coatings strongly bonded to C35 steel substrates previously pre-oxidized in CO2. The experimental tool is based on the “silver print test”. It consists in covering the central part of the samples with a thin layer of silver paint before coating in order to create a defect zone. Concerning the numerical part, the finite element method is used as a powerful tool to describe the mechanical phenomena at the local scale influencing the crack propagation. The obtained numerical results show a good agreement with the experimental observations and they allow a local description of the phenomena influencing the cracking mechanism. Moreover, they lead to a concrete proposition for improving the coatings adherence.

Published
2020

46. Discrete element method using cohesive plastic beam for modeling elasto-plastic deformation of ductile materials

Author

Vinh D. X. Nguyen, Lihong Su, Damien André, Hongtao Zhu, A. Kiet Tieu, University of Wollongong [Australia], IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), 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), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Timoshenko beam theory, Materials science, 0211 other engineering and technologies, Computational Mechanics, 02 engineering and technology, Plasticity, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Physics::Geophysics, Ultimate tensile strength, von Mises yield criterion, 0101 mathematics, Composite material, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, Civil and Structural Engineering, Fluid Flow and Transfer Processes, Numerical Analysis, [CHIM.MATE]Chemical Sciences/Material chemistry, 16. Peace & justice, Discrete element method, 010101 applied mathematics, Computational Mathematics, Modeling and Simulation, Deformation (engineering), Beam (structure), Necking
Abstract

This paper introduces a three-dimensional (3D) simulation to model the elasto-plastic deformation of ductile materials by discrete element method (DEM) using cohesive plastic beam approach. The Euler–Bernoulli beam theory is applied to calculate force and torque reactions of the cohesive beam bond that can account for plastic strain. In order to simulate the elasto-plastic behavior of materials, a coupled model of plasticity and damage is proposed for the cohesive beam bond. The von Mises yield criterion, a modified perfectly plastic law and an exponential damage law are implemented to simulate behaviors of ductile materials such as steel and aluminum in tensile tests. It is then further applied to investigate the ductile fracture modes such as localized shear fracture and necking phenomenon with cup-and-cone shape. Finally, the proposed DEM model using cohesive plastic beam is applied to visualize the compression test of cylindrical steel sample and wrinkle deformation of steel tube under bucking due to axial compression. This paper is the first attempt to model ductile materials by DEM with cohesive beam bond in tension, compression and buckling. All of the numerical benchmarks demonstrate the power of DEM using cohesive beam bond to model ductile materials with fracture, large deformation and elasto-plastic behavior.

Published
2020

47. Additive-free low temperature sintering of amorphous Si B C powders derived from boron-modified polycarbosilanes: Toward the design of SiC with tunable mechanical, electrical and thermal properties

Author

Ondrej Hanzel, Pavol Šajgalík, Nicolas Tessier-Doyen, Samuel Bernard, Ricardo Antonio Francisco Machado, Maxime Balestrat, Emanoelle Diz Acosta, Zoltán Lenčéš, IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), 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), Slovak Academy of Sciences (SAS), IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), and University of Minho [Braga]

Subjects
010302 applied physics, Materials science, Sintering, chemistry.chemical_element, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Crystallinity, Thermal conductivity, chemistry, Electrical resistivity and conductivity, visual_art, 0103 physical sciences, Vickers hardness test, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Ceramic, Composite material, 0210 nano-technology, Boron, Elastic modulus, ComputingMilieux_MISCELLANEOUS
Abstract

Additive-free SiC ceramics are prepared from polymer-derived powders with Si, C and B elements homogeneously distributed on the atomic level by rapid hot-pressing at 1750 °C and 1800 °C under argon and a load of 50 MPa. As-sintered samples display a Vickers hardness in the range of 9.6 ± 0.5 GPa–17.3 ± 1.9 GPa and an elastic modulus varying from 137 ± 3.4 GPa to 239 ± 6 GPa, both depending on the sample phase composition, crystallinity and porosity. Accordingly, the electrical conductivity changes from 340 to 3900 S/m whereas the thermal conductivity varies from 17.7 to 45.1 W/m⋅K as a function of these characteristics. Thus, we demonstrated that a polycarbosilane containing 0.7 wt.% of boron could produce boron-doped SiC powders that demonstrate tailored sinterability at temperatures as low as 1750 °C to form nearly dense SiC ceramics with adjusted hardness, Young’s modulus, electrical and thermal conductivities.

Published
2020

48. Microstructure and physico-chemical transformation of some common woods from Cameroon during drying

Author

Sylvie Rossignol, Epiphanie Nouemsi Soubgui, Cristina Leonelli, Elie Kamseu, René Oum Lissouck, Rufin Theophile Tene Fongang, Likiby Boubakar, Fernanda Andreola, MINRESI/MIPROMALO, National Advanced School of Engineering (University of Yaounde I), University of Modena and Reggio Emilia, 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), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
040101 forestry, Thermogravimetric analysis, Materials science, Macropore, [CHIM.MATE]Chemical Sciences/Material chemistry, 04 agricultural and veterinary sciences, 02 engineering and technology, 15. Life on land, Wood drying, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, chemistry, Chemical engineering, Decomposition process, Density, Porosity, Wood, 0401 agriculture, forestry, and fisheries, Lignin, Hemicellulose, Physical and Theoretical Chemistry, Cellulose, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

The influence of drying on the microstructure, physical and chemical properties of some tropical wood species has been investigated using thermogravimetric analysis, differential scanning calorimetric (DSC), FTIR-ATR spectroscopy, mercury intrusion porosimetry (MIP) and environmental scanning electron microscopy (ESEM) analysis. Eleven tropical species were used in this study. Results showed that the common Cameroonian wood species can be grouped into three classes: Ga (lightwood) with cross-linking fibers having high volume of macropores, density in the range 0.2–0.4 g cm−3 and high lignin content; Gb (medium dense) with unidirectional fibers packing, density around 0.6 g cm−3 and Gc group showing high densification of unidirectional fibers and low porosity justifying the density > 0.8 g cm−3. Both the Gb an Gc groups have less significant lignin content. A relatively high rate of drying for Ga with respect to low drying rate for Gc was observed in direct relation with their porosity of ~ 72 Vol% and ~ 36 Vol%, respectively. LTF and WG showed similar cumulative pore volume (0.44 mL g−1) with different pore size distribution: 28% and 22% of macropores, 39% and 60% of mesopores and 33% and 18% micropores, respectively. Thermal analysis revealed that lightwoods have the highest amounts of residues and lower thermal stability of chemical components than dense woods. It has been found that the degradation process of hemicellulose, cellulose and lignin occurs mainly at about 200–300 °C, 300–350 °C and 350–500 °C, respectively. The group Ga with low drying rate, a low cycle of reproduction, a high volume of porosity together with large pore sizes appeared promising candidates for the design of ecological, environmental and sustainable management policy of wood transformation in developing countries and even worldwide.

Published
2020

49. Use of Permacol™ to restore depression after temporal muscle flap: A case report

Author

Jérôme Laloze, J. Usseglio, Benoit Chaput, J. Brie, CHU Toulouse [Toulouse], IRCER - Axe 1 : procédés céramiques (IRCER-AXE1), 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), Hôpital de Rangueil, Service de Chirurgie maxillo-faciale, réparatrice et stomatologie [CHU Limoges], and CHU Limoges

Subjects
medicine.medical_specialty, business.industry, Biomaterial, [CHIM.MATE]Chemical Sciences/Material chemistry, 030206 dentistry, Temporalis muscle flap, Temporal muscle, [SPI.MAT]Engineering Sciences [physics]/Materials, 3. Good health, Surgery, 03 medical and health sciences, 0302 clinical medicine, Otorhinolaryngology, medicine, Basal cell, Oral Surgery, Temporal fossa, 030223 otorhinolaryngology, Dermal matrix, business, ComputingMilieux_MISCELLANEOUS, Depression (differential diagnoses)
Abstract

The temporal muscle has been an essential tool in maxillo-facial reconstruction for more than a century. Despite many technical advances, depression in the temporal fossa after its use is a constant issue. There are several ways to fill this defect. However, their efficiency has not been proven. Currently, biomaterials (e.g. polymethylmethacrylate [PMMA] and polyethylene [PE]) are the alternative most frequently used and studied. This is the first case report of temporal depression filling with a porcine dermal matrix (Permacol™). A 58-year-old woman underwent limited maxillectomy for squamous cell carcinoma of the upper vestibular mucosa, after which a pure temporalis muscle flap was used for immediate reconstruction. A custom-shaped Permacol™ sheet was used with a PMMA spacer to fill the resulting depression at the temporal fossa. The procedure went smoothly without any complications. The surgeon and the patient are satisfied with the cosmetic result. Permacol™ is a safe and effective tool to fill defects after temporalis muscle flap and is an excellent alternative to other biomaterials currently on the market.

Published
2020

50. HIGH-TEMPERATURE, RESISTANT, ARGILLITE-BASED, ALKALI-ACTIVATED MATERIALS WITH IMPROVED POST-THERMAL TREATMENT MECHANICAL STRENGTH

Author

Svetlana Petlitckaia, Tohoue Monique Tognonvi, Xavier Bourbon, Ameni Gharzouni, Sylvie Rossignol, Myriam Fricheteau, N. Texier-Mandoki, Université Péléforo Gon Coulibaly, UFR des Sciences Biologiques, Korhogo BP 1328, Côte d’Ivoire, 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), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), 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), and Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA)

Subjects
Materials science, Soil Science, 020101 civil engineering, 02 engineering and technology, Thermal treatment, engineering.material, Raw material, Wollastonite, [SPI.MAT]Engineering Sciences [physics]/Materials, 0201 civil engineering, law.invention, Geochemistry and Petrology, law, Impurity, Earth and Planetary Sciences (miscellaneous), Calcination, ComputingMilieux_MISCELLANEOUS, Water Science and Technology, Metallurgy, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Geopolymer, Compressive strength, engineering, 0210 nano-technology, Leucite
Abstract

Fire resistance performance is one of the most important requirements in geological storage conditions in order to improve the resistance of storage packages to high thermal constraints (in the case of a fire for example). With the need to develop new fire-resistant materials, the aim of the present study was to develop fire-resistant geopolymer binders based on Callovo-Oxfordian (COx) argillite. Two types of kaolin with different degrees of purity were mixed with argillite in various proportions. These mixtures were calcined at 600 or 750°C. In order to assess the fire resistance of activated materials, thermal treatment at 1000°C was performed. The compressive strength and mineralogical composition of the samples were investigated before and after heat treatment. The results showed that the addition of argillite improved significantly the thermomechanical properties of kaolin-based geopolymers containing impurities, especially the mixture containing 67% argillite and calcined at 750°C. This phenomenon was not observed for the pure-kaolin geopolymer. Improvement of fire resistance was due to the formation in situ of leucite and zeolite-type phases (KAlSi2O6 and KAlSiO4) and of wollastonite (CaSiO3) at high temperature, which is linked to the Ca available in the raw materials.

Published
2020

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