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

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

Applied physics letters, 2014-09, Vol.105 (13) [Periódico revisado por pares]

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Título:
High-performance thermoelectric minerals: Colusites Cu26V2M6S32 (M = Ge, Sn)
Autor: Suekuni, Koichiro ; Kim, Fiseong S. ; Nishiate, Hirotaka ; Ohta, Michihiro ; Tanaka, Hiromi I. ; Takabatake, Toshiro
Assuntos: Copper ; Figure of merit ; Germanium ; Thermal conductivity ; Thermoelectricity ; Tin
É parte de: Applied physics letters, 2014-09, Vol.105 (13)
Descrição: 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.
Editor: Melville: American Institute of Physics
Idioma: Inglês

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