6533b833fe1ef96bd129c20b
RESEARCH PRODUCT
Improving thermoelectric performance of TiNiSn by mixing MnNiSb in the half-Heusler structure
Claudia FelserGudrun AuffermannGerhard H. FecherTanya BerryGuido KreinerBenjamin BalkeWalter SchnelleSiham Ouardisubject
Condensed Matter - Materials ScienceMaterials scienceAnnealing (metallurgy)Analytical chemistryGeneral Physics and AstronomyMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technologyDisordered Systems and Neural Networks (cond-mat.dis-nn)Condensed Matter - Disordered Systems and Neural Networks010402 general chemistry021001 nanoscience & nanotechnologyThermal conduction01 natural sciences0104 chemical sciencesDifferential scanning calorimetryDifferential thermal analysisPhase (matter)Thermoelectric effectFigure of meritPhysical and Theoretical Chemistry0210 nano-technologyExtrinsic semiconductordescription
The thermoelectric properties of n type semiconductor, TiNiSn is optimized by partial substitution with metallic, MnNiSb in the half Heusler structure. Herein, we study the transport properties and intrinsic phase separation in the system. The Ti1-xMnxNiSn1-xSbx alloys were prepared by arc-melting and were annealed at temperatures obtained from differential thermal analysis and differential scanning calorimetry results. The phases were characterized using powder X-ray diffraction patterns, energy dispersive X-ray spectroscopy, and differential scanning calorimetry. After annealing the majority phase was TiNiSn with some Ni rich sites and the minority phases was majorly Ti6Sn5, Sn, and MnSn2. Ni rich sites were caused by Frenkel defects, this led to a metal-like behavior of the semiconducting specimens at low temperature. For x up to 0.05 the samples showed an activated conduction, whereas for x>0.05 they showed metallic character. The figure of merit for x=0.05 was increased by 61% (ZT=0.45) in comparison to the pure TiNiSn.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-12-19 |