[21p-C102-1~17] 9.4 Thermoelectric conversion

[21p-C102-6] Structural and thermoelectric properties of colusites Cu₂₆T₂M₃Sb₃S₃₂ (T = V, Nb, Ta; M = Ge, Sn)

〇Koichiro Suekuni¹, Takashi Hagiwara¹, Seiya Takahashi², Eiji Nishibori², Philipp Sauerschnig³, Michihiro Ohta³, Michitaka Ohtaki¹ (1.Kyushu Univ., 2.Univ. of Tsukuba, 3.AIST GZR)

Keywords:thermoelectric materials, sulfides

Colusites Cu₂₆T₂M₆S₃₂ have the combination of low thermal conductivity and relatively high power factor in the temperature range of 300–673 K. In the previous work for M = Ge colusites, the power factor was enhanced by decreasing the size of T cation on going from W, Mo, to Cr. In this work, we investigated effects of the size of T cation as well as M cation on the structural and thermoelectric properties of Cu₂₆T₂M₃Sb₃S₃₂ (T = V, Nb, Ta; M = Ge, Sn) colusites.