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

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

doi:10.1063/1.4896998

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

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

Research output: Contribution to journal › Article › peer-review

68 Citations (Scopus)

Abstract

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 language	English
Article number	132107
Journal	Applied Physics Letters
Volume	105
Issue number	13
DOIs	https://doi.org/10.1063/1.4896998
Publication status	Published - Sep 29 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4896998

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

abstract = "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.",

author = "Koichiro Suekuni and Kim, {Fiseong S.} and Hirotaka Nishiate and Michihiro Ohta and Tanaka, {Hiromi I.} and Toshiro Takabatake",

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AU - Suekuni, Koichiro

AU - Kim, Fiseong S.

AU - Nishiate, Hirotaka

AU - Ohta, Michihiro

AU - Tanaka, Hiromi I.

AU - Takabatake, Toshiro

PY - 2014/9/29

Y1 - 2014/9/29

N2 - 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.

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