| 研究実績の概要 |
This proposal aims to develop high-performance and environmentally friendly half-Heusler thermoelectric materials based on the multiscale microstructure approach to recycle high-temperature waste heat energy. By careful fine compositional tuning, a series of relatively low-cost (Ti,Zr)Ni1+xSn-based half-Heusler alloys contained the microscale half-Heusler phase-separated domains, full-Heusler nanoprecipitates, the atomic scale Ti-Zr modulated structures, and various atomic disorders. The phase stability of these microstructures could be improved simply by subjecting the alloys to a cyclic heating-cooling process at high temperatures between 900 to 1150 degrees Celsius. Among the alloys, the thermoelectric property of an Nb-doped alloy showed the highest ZT of up to 0.87 at 752 K.
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