[15a-E206-1~12] 9.4 Thermoelectric conversion

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

〇(D)Kevin Delime¹, Akio Yamamoto¹, Tsunehiro Takeuchi^1,2,3 (1.Toyota Tech. Inst., 2.PRESTO,Jap. Sci.Tech. Ag., 3.GREMO, Nagoya Univ.)

Keywords: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.