[15a-E206-1~12] 9.4 熱電変換

▲ [15a-E206-7] Thermoelectric properties of half Heusler FeV_1-xTi_xSb

〇(D)Delime Kevin¹、Yamamoto Akio¹、Takeuchi Tsunehiro^1,2,3 (1.Toyota Tech. Inst.、2.PRESTO,Jap. Sci.Tech. Ag.、3.GREMO, Nagoya Univ.)

キーワード：Thermoelectric, half-Heusler phase, Calculation

The FeVSb half-Heusler phase (HH-phase) consisting solely of cheap, no-toxic elements was studied as a new thermoelectric material. By uses of strategic guidance¹ and theoretical calculation, we determined that the FeVSb HH-phase was expected to possess a large figure of merit ZT = S²/ρκ exceeding 0.8 with p-type behavior (Fig. 1.a). Despite the prediction, the reported material only showed n-type behavior² (Fig. 2.a). In this study, we tried to reduce the electron concentration of the FeVSb HH-phase by substituting pentavalent V with tetravalent Ti for optimizing the ZT value.