[22a-13P-1~11] 9.4 Thermoelectric conversion

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[22a-13P-8] P-type thermoelectric properties of half-Heusler alloys TiNi_1-xCo_xSn

〇Kosuke Yamazaki¹, Hiromichi Togashi¹, Hiroshi Nakatsugawa¹, Yoichi Okamoto² (1.Yokohama Natl. Univ., 2.Natl. Def. Acad.)

Keywords:

half-Heusler,thermoelectric,ark melting

Half-Heusler alloy TiNiSn, composed of elements with low environmental impact, is a thermoelectric material with a high power factor. In this study, TiNi_1-xCo_xSn (0≤x≤0.15) substituted with Co, which has fewer valence electrons than Ni, was prepared by the arc melting method to change the majority carrier of TiNiSn. Measurements were carried out to identify the crystalline phase using powder XRD measurements and Rietveld analysis, and thermoelectric properties were measured in the range 80 ~800 K. As a result, we found that Co substitution inverts the sign of Seebeck coefficient and changes the majority carriers.