[21a-B203-1~11] CS.12 Code-sharing Session of 9.4 & M

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[21a-B203-7] Thermoelectric properties of sulfur-deficient colusite Cu₂₆Ti₂Sb₄Ge₂S₃₂

〇Koichiro Suekuni¹, Philipp Sauerschnig², Michihiro Ohta², Michitaka Ohtaki¹ (1.Kyushu Univ., 2.AIST GZR)

Keywords:

thermoelectric materials,sulfides,colusite

We recently discovered a colusite Cu₂₆Ti₂Sb_6-xGe_xS₃₂ with excellent thermoelectric properties. Subsequent investigations suggested that the sulfur defect produced during synthesis process makes impacts on the thermoelectric properties. In this study, we prepared samples with controlled sulfur deficiency and investigated their crystal structures and thermoelectric properties. As a result, we found that the sulfur deficiency decreases the hole carrier concentration and reduces the lattice thermal conductivity near room temeperature.