Thermoelectric properties of FeV_(0.955-x)Hf_（0.045）TixSb half-Heusler phase

摘要

The FeVSb half-Heusler phase (HH-phase), consisting solely of cheap and non-toxic elements was studied as a new thermoelectric material. By using theoretical calculations(1), we found that the FeVSb HH-phase is capable of possessing a large figure of merit ZT = S2T/ρκ exceeding 0.80 at a p-type condition at 700 K. To confirm this prediction, we prepared FeV1-xTixSb HH-phases alloys and found that the figure of merit ZT of FeV1-xTixSb HH-phases showed almost the same ZT-value as that predicted; ZT = 0.63 for FeV0.80Ti0.20Sb at 700 K. Notably, this value is the highest ever reported(2) for FeVSb-based HH-phases.