A5006285354- Rare-earth and actinide compounds
- Advanced Thermoelectric Materials and Devices
- Heusler alloys: electronic and magnetic properties
- Magnetic Properties of Alloys
- Iron-based superconductors research
- Magnetic and transport properties of perovskites and related materials
- Chalcogenide Semiconductor Thin Films
- Intermetallics and Advanced Alloy Properties
- Phase-change materials and chalcogenides
- MXene and MAX Phase Materials
- Physics of Superconductivity and Magnetism
- Boron and Carbon Nanomaterials Research
- High-pressure geophysics and materials
- Thermodynamic and Structural Properties of Metals and Alloys
- Thermal properties of materials
- Inorganic Chemistry and Materials
- Superconductivity in MgB2 and Alloys
- Thermal Expansion and Ionic Conductivity
- Advanced Chemical Physics Studies
- Magnetic properties of thin films
- Topological Materials and Phenomena
- nanoparticles nucleation surface interactions
- Semiconductor materials and interfaces
- Advanced Condensed Matter Physics
- 2D Materials and Applications
Université Paris-Est Créteil
2014-2024
Institut de Chimie et des Matériaux Paris-Est
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Paris-Est Sup
2016
Université Paris Cité
1995-2010
Laboratoire de Chimie
2004-2005
Laboratoire de Chimie Physique
1995-2005
Université Paris-Sud
1997-2003
Terres Univia
2003
Laboratoire de Chimie Moléculaire et Thioorganique
2001
A round robin test aiming at measuring the high-temperature thermoelectric properties was carried out by a group of European (mainly French) laboratories (labs). Polycrystalline skutterudite Co0.97Ni0.03Sb3 characterized Seebeck coefficient (8 labs), electrical resistivity (9 thermal diffusivity (6 mass volume density and specific heat labs) measurements. These data were statistically processed to determine uncertainty on all these measured quantities as function temperature combined obtain...
Abstract Thermoelectric generators (TEGs) offer a versatile solution to convert low‐grade heat into useful electrical power. While reducing the length of active thermoelectric legs provides an efficient strategy increase maximum output power density p max , both high contact resistances and thermomechanical stresses are two central issues that have so far prevented strong reduction in volume materials integrated. Here, it is demonstrated these barriers can be lifted by using nonconventional...
In this work, we report the structural, magnetic and electrical thermal transport properties of Heusler-type alloy Ru2NbAl. From detailed analysis magnetization data, infer presence superparamagnetically interacting clusters with a Pauli paramagnetic background, while short-range ferromagnetic interaction is developed among below 5 K. The confirmed through heat capacity measurements. relatively small value electronic contribution to specific heat, gamma (~2.7 mJ/mol-K2), as well linear...
We have investigated the thermal and electrical properties of filled skutterudites belonging to series Ce1−zYbzFe4Sb12 Cey∕2Yby∕2Fe4−x(Co∕Ni)xSb12, as well their potential for thermoelectric power generation. In first series, increasing Yb fraction decreases resistivity thermopower. These effects are related variations valence with (from 2.2 in Yb0.92Fe4Sb12 2.7 Ce0.85Yb0.05Fe4Sb12). The factor is increased Ce0.40Yb0.53Fe4Sb12 while conductivity reduced this leads an improved figure merit...
We report a thorough experimental study on the microstructure, thermal behavior and thermoelectric properties of amorphous composition Cu15As30Te55 glass–ceramics related-compounds synthesized by using Spark Plasma Sintering (SPS) technique. Varying conditions SPS process enables synthesis composite glassy-crystalline samples with different crystal/glass ratios. Such treatments result in complex microstructures composed large glassy domains where nanocrystals metastable β-As2Te3 phase are...
An experimental and modeling study of glass–crystal Si<sub>10</sub>As<sub>15</sub>Te<sub>75</sub>–Bi<sub>0.4</sub>Sb<sub>1.6</sub>Te<sub>3</sub> composites.
β-As2Te3 belongs to the family of Bi2Te3-based thermoelectric alloys, a well-known class efficient materials and 3D topological insulators. It is demonstrated that substituting Sn for As enables hole concentration be tuned. These findings may open new avenues search more realization 3D-topological service our authors readers, this journal provides supporting information supplied by authors. Such are peer reviewed re-organized online delivery, but not copy-edited or typeset. Technical support...
Besides alloying, nanostructuring was implemented to improve the thermoelectric properties in Fe2VAl. This Heusler alloy indeed displays a figure of merit too small for applications (ZT ~ 0.1 at 300 K) which is caused by large lattice thermal conductivity (λL = 27 W·m−1·K−1 K). The effect on microstructure and alloyed Fe2VAl are therefore reviewed. By mechanical alloying followed spark plasma sintering, average grain size (D) decreased D 300–400 nm Fe2VAl0.9Si0.1, Fe2VAl0.9Si0.07Sb0.03,...
Half-metallic ferromagnets (HMF) are on one of the most promising materials in field spintronics due to their unique band structure consisting spin sub-band having metallic characteristics along with another semiconductor-like behavior. In this work, we report synthesis a novel quaternary Heusler alloy FeMnVAl and have studied structural, magnetic, transport, electronic properties complemented first-principles calculations. Among different possible structurally ordered arrangements, optimal...
In this work, we report the successful synthesis of a Fe-based novel half-metallic quaternary Heusler alloy FeMnVGa and its structural, magnetic transport properties probed through different experimental methods theoretical technique. Density functional theory (DFT) calculations performed on types structure reveal that Type-2 ordered (space group: F-43m, Ga at 4a, V 4b, Mn 4c Fe 4d) possess minimum energy among all variants. Ab-initio simulations in Type 2 further compound is ferromagnet...
Co-based Heusler alloys are attracting considerable interest as they were found to be suitable for spin-injection processes, and the generation of spin-polarized currents via spin-Seebeck effect. Co2HfSn has been proved one most promising candidates this application, since it combines remarkable half-metallic properties, compositional doping versatility, ease preparation, high Curie temperature, sufficiently Seebeck coefficient. In work, compound was synthesized by rapid solidification...
Metastable β-As2Te3 (R3̅m, a = 4.047 Å and c 29.492 at 300 K) is isostructural to layered Bi2Te3 known for similarly displaying good thermoelectric properties around 400 K. Crystallizing glassy-As2Te3 leads multiphase samples, while could indeed be synthesized with phase purity (97%) by melt quenching. As expected, reconstructively transforms into stable α-As2Te3 (C2/m, 14.337 Å, b 4.015 9.887 β 95.06°) 480 This → α transformation can seen as the displacement of part atoms from their As2Te3...
The Ba8ZnxGe46−x−y◻y (4 ≤ x 8, ◻ = Ge vacancy) solid solution crystallizes in the clathrate type I structure as indicated by X-ray powder diffraction and transmission electron microscopy. fraction of vacancies (y) derived from probe microanalysis varies like y 3.3 − 0.54x for 0 6 < 8. A simplified band picture can explain how ratio (2−)/(4−) formal oxidation numbers zinc vacancy leads to ∼1/2 slope f(x) relation. Hall effect measurements indicate that definitely deviate Zintl rule when 4,...
A high temperature Seebeck coefficient or electrical resistivity apparatus has been designed and fabricated to measure sample with typical size ∼10 × 1 mm3. It can both transport properties from 300 K 1000 in argon atmosphere. The lies transversely on top of two metallic half-cylinders, which contain heating cartridges allow thermal gradient control reversal. is measured by type N thermocouples pressed against the upper surface sample. key feature this disk-shaped junction each thermocouple...
Substitution of Sn for As in α-As<sub>2</sub>Te<sub>3</sub> enhances the thermoelectric performances with a maximum ZT 0.8 at 523 K.