A5073047837- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Inorganic Chemistry and Materials
- Crystal Structures and Properties
- Iron-based superconductors research
- Thermal properties of materials
- Rare-earth and actinide compounds
- Heusler alloys: electronic and magnetic properties
- Intermetallics and Advanced Alloy Properties
- Synthesis and characterization of novel inorganic/organometallic compounds
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and interfaces
- 2D Materials and Applications
- Thermal Expansion and Ionic Conductivity
- Phase-change materials and chalcogenides
- Advanced Thermodynamics and Statistical Mechanics
- Solid-state spectroscopy and crystallography
- Crystallization and Solubility Studies
- Topological Materials and Phenomena
- X-ray Diffraction in Crystallography
- Organometallic Compounds Synthesis and Characterization
- Superconductivity in MgB2 and Alloys
- Thermal Radiation and Cooling Technologies
- Thermodynamic and Structural Properties of Metals and Alloys
- Advanced Condensed Matter Physics
Laboratoire de Cristallographie et Sciences des Matériaux
2013-2024
École Nationale Supérieure d'Ingénieurs de Caen
2014-2024
Centre National de la Recherche Scientifique
2014-2024
Université de Caen Normandie
2016-2024
Normandie Université
2017-2024
University of Cyprus
2013
University of California, Davis
2006-2008
California Institute of Technology
2005-2007
California State Polytechnic University
2007
Université de Montpellier
2006-2007
Thermoelectric materials provide a key solution to energy problems through the conversion of heat into electrical energy. We report that complex Zintl compound, Yb14MnSb11, breaks 2-decade stagnation in high-temperature (>900 K), p-type development for thermoelectric power generation. This material achieves quadrupled efficiency and virtually doubled figure merit over current state-of-the-art, SiGe, thus earmarking it superior applications segmented devices. Yb14MnSb11 represents first phase...
Abstract Zintl phases are ideal candidates for efficient thermoelectric materials, because they typically small‐bandgap semiconductors with complex structures. Furthermore, such allow fine adjustment of dopant concentration without disrupting electronic mobility, which is essential optimizing material efficiency. The tunability demonstrated the series Ca x Yb 1– Zn 2 Sb (0 ≤ 1). Measurements electrical conductivity, Hall Seebeck coefficient, and thermal conductivity (in 300–800 K temperature...
In this review we discuss considerations regarding the common techniques used for measuring thermoelectric transport properties necessary calculating figure of merit, <italic>zT</italic>.
Abstract This paper presents tables of key thermoelectric properties, which define conversion efficiency, for a wide range inorganic materials. The twelve families materials included in these are primarily selected on the basis well established, internationally-recognized performance and promise current future applications: tellurides, skutterudites, half Heuslers, Zintls, Mg–Sb antimonides, clathrates, FeGa 3 -type materials, actinides lanthanides, oxides, sulfides, selenides, silicides,...
The ultralow thermal conductivity of AgCrSe2 is achieved by taking advantage the cationic disorder in interlayer spacing structure. This leads to a thermoelectric figure merit higher than 1 at 800K. unique case opens route discovery other efficient materials.
Utilizing the decomposition of metastable Pb2Sb6Te11 into PbTe and Sb2Te3, we produced a layered (lamellar) microstructure Sb2Te3 in which interlamellar spacing can be controlled by temperature time process. Adjacent lamellae are crystallographically oriented, indicating high-quality epitaxy-like interfaces. Average lamellar spacings as small 180 nm observed, corresponding to layer thickness 40 nm. These nanoscale multilayers, formed bulk processing, resemble thin-film superlattice...
Different families of thermoelectric materials have been investigated since the discovery effects in mid-19th century, mostly belonging to family degenerate semi-conductors. In last 20 years, new following different theoretical proposals, showing that nanostructuration, electronic correlations and complex crystallographic structures (low dimensional structures, large number atoms per lattice, presence 'rattlers'...) could enhance properties by enhancing Seebeck coefficient and/or reducing...
Abstract In this paper, we show how the thermoelectric properties can be modified in crystallographic structures based on CdI 2 type layer, by changing block layers between these or going from oxides to selenides and sulfides. case of oxides, unique generated will demonstrated Bi‐based misfit compounds. By combining Hall effect, resistivity, Seebeck coefficients single crystals family, importance doping spin orbital degeneracy term coefficient shown. From crystal investigation, power factor...
The feasibility to synthesize, in large quantity, pure, and nontoxic tetrahedrite compounds using high‐energy mechanical‐alloying from only elemental precursors is reported this study for the first time. Our processing technique allows a better control of final product composition leads high thermoelectric performances ( ZT 0.75 at 700 K), comparable that on sealed tube synthesis samples. Combined with spark plasma sintering, production highly pure dense samples achieved very short time,...
Exceptionally high thermoelectric figure of merit (zT&gt;2), has been reported for (Ag1−ySbTe2)0.05(PbTe)0.95, which may involve the nanoscale microstructure. However, conflicting reports on same materials claim only zT 1 or less. Here we show that (Ag1−ySbTe2)0.05(PbTe)0.95 are multiphase scale millimeters despite appearing homogeneous by x-ray diffraction and routine electron microscopy. Using a scanning Seebeck microprobe, find significant variation coefficient (including both n-type...
We present results of extensive theoretical and experimental investigations Mg 2 Si Sn their 1-x x alloys. Electronic phonon properties binary compounds were studied by ab initio calculations. Then, both synthesized the solid-state reaction electrical resistivity thermopower was measured at high temperature (300–900 K). In compounds, bandgaps (0.56 eV in 0.16 ) agree very well with values (0.6 0.17 from activation law upon applying modified Becke–Johnson semilocal exchange potential...
The ultra fast synthesis of nanocrystalline Mg2Si was carried out using microwave radiation. elemental precursors were first milled together under dry conditions to get fine particles. resulting mixture powders Mg and Si cold pressed before being heated by irradiation. Precursors products analyzed X-ray diffraction scanning electron microscopy. high energy ball milling parameters utilized prepare the reactive have quite an influence on behavior Moreover, SEM imaging demonstrates that power...
For the first time, quantitative texture analysis of edge free sintered Bi 2 Te 2.4 Se 0.6 samples elaborated by high‐energy ball milling and Spark Plasma Texturing is performed. As expected, due to structural anisotropy, forging process results in a significant decrease electrical resistivity perpendicularly uniaxial stress field. Surprisingly, this also leads large lattice thermal conductivity direction. Crystallite boundaries amorphization as evidenced transmission electron microscopy...
This study presents the thermoelectric properties of substituted on Cu site and/or sulfur deficiency CuFeS<sub>2</sub> chalcopyrite based series Cu<sub>1−x</sub>M<italic>x</italic>FeS<sub>2−y</sub> (M = Mn, Co, Ni, <italic>x</italic> ≤ 0.05 and <italic>y</italic> 0.02).
Abstract In materials science, the substructure approach consists in imagining complex which a particular property is associated with distinct structural feature, so as to combine different chosen physical characteristics, otherwise have little chance coexist. Applied thermoelectric materials, it has been used achieve simultaneously phonon-glass and electron-crystal properties. Mostly studied for its superionic conductivity, AgCrSe 2 naturally layered compound, achieves very low thermal ~0.4...