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3 results on '"Katia Favier"'

1. Thermoelectric properties of an N-type silicon–germanium alloy related to the presence of silica nodules dispersed in the microstructure

Author

Mathieu Soulier, Katia Favier, Julia Simon, Benoit Deniau, Pauline Grondin, Mathieu Boidot, Jean Leforestier, Christelle Navone, and Guillaume Bernard-Granger

Subjects
Materials science, Mechanical Engineering, Metallurgy, Alloy, Metals and Alloys, Spark plasma sintering, chemistry.chemical_element, Germanium, engineering.material, Condensed Matter Physics, Microstructure, Thermoelectric materials, Thermal conductivity, chemistry, Mechanics of Materials, Thermoelectric effect, engineering, General Materials Science, Crystallite, Composite material
Abstract

Tailoring the amount of nanometer-sized nodules made of amorphous silica, resulting from natural oxidation during the processing steps, in an N-type sintered polycrystalline Si92Ge08 material is shown as an effective way to reduce the thermal conductivity without affecting significantly the thermoelectric power factor.

Published
2014

2. Influence of in-situ formed MoSi2 inclusions on the thermoelectrical properties of N-type silicon-germanium alloy

Author

Jean Leforestier, Mathieu Soulier, Jean-Claude Tedenac, Katia Favier, Mathieu Boidot, Didier Ravot, Guillaume Bernard-Granger, Christelle Navone, Julia Simon, Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), and Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Polymers and Plastics, Metallurgy, Composite number, Alloy, Doping, Metals and Alloys, chemistry.chemical_element, Sintering, Spark plasma sintering, Germanium, engineering.material, Thermoelectric materials, Electronic, Optical and Magnetic Materials, chemistry, Molybdenum, Ceramics and Composites, engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Composite material
Abstract

International audience; An N-type Si92Ge08 (7000 at. ppm P doping) powder (matrix) prepared by mechanical alloying was homogeneously mixed with 1.3 vol.% nanosized molybdenum. The "composite" and matrix powders were sintered by spark plasma sintering, using optimized parameters. The as-sintered "composite" material exhibits a dimensionless thermoelectrical figure of merit (ZT) of ∼1.0 at 700 °C. For the same temperature, the ZT value is only 0.7 for the as-sintered matrix alone. In the composite material, transmission electron microscopy observations enable the detection of nanosized (average diameter of ∼30 nm) MoSi2 inclusions that formed in situ during sintering via the reaction between the native silicon-germanium matrix and the added molybdenum particles. The presence of such nanosized inclusions reduces significantly the lattice contribution to the thermal conductivity of the sintered "composite" material, explaining the strong increase of the ZT parameter in comparison to the sintered matrix alone.

Published
2014

3. Evaluating possibilities of Self-propagating High temperature Synthesis (SHS) for substitution of Ge for Si in MoSi2

Author

Katia Favier, Dinesh K. Paramasivam, Florence Rouessac, Didier Ravot, Rose-Marie Ayral, Romain Viennois, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)

Subjects
010302 applied physics, Chemistry, Substitution (logic), Self-propagating high-temperature synthesis, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, 01 natural sciences, 7. Clean energy, Chemical physics, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract

International audience; Self-propagating High temperature Synthesis is used to study materials obtained from Mo+Si+Ge system. Si1-xGex is known to be one of the most efficient thermoelectric but its use is limited by high price and scarcity of germanium, relatively low value of its ZT and high temperature of working. One way to increase its ZT consists in increasing the diffusion of the acoustic phonons by inserting silicides nano-inclusions of MoSi2 inside the Si1-xGex matrix. In this sense it is important to study the Mo(Si1-xGex)2 solid solutions.

Published
2013

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