High-performance thermoelectric minerals: Colusites Cu26V2M6S32 (M = Ge, Sn)

Koichiro Suekuni, Fiseong S. Kim, Hirotaka Nishiate, Michihiro Ohta, Hiromi I. Tanaka, Toshiro Takabatake

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109 Citations (Scopus)


We report thermoelectric (TE) properties of dense samples of colusites Cu26V2M6S32 (M = Ge, Sn), most of which are composed of earth-abundant elements; Cu and S. The combination of p-type metallic conduction and large thermopowers greater than 200 μV/K leads to high TE power factors of 0.61 and 0.48 mW/K2 m at 663 K for M = Ge and Sn samples, respectively. Furthermore, the lattice thermal conductivity is smaller than 0.6 W/Km over the temperature range from 350 K to 663 K due to the structural complexity. As a consequence, the values of dimensionless TE figure of merit ZT for M = Ge and Sn reach 0.73 and 0.56 at 663 K, respectively. Thus, the colusites are promising candidates for environmental friendly TE materials usable in the range of 500-700 K.

Original languageEnglish
Article number132107
JournalApplied Physics Letters
Issue number13
Publication statusPublished - Sept 29 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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