[22a-B203-1~11] 9.4 Thermoelectric conversion

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[22a-B203-3] Crystal structure and thermoelectric properties of half-Heusler alloy Co substituted TiNiSn

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

Keywords:

half-Heusler,thermoelectric,TiNiSn

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 K~800 K. As a result, at x=0.10, the sign of the Seebeck coefficient reversed, indicating a change in majority carriers.