TY - JOUR
T1 - High-performance thermoelectric minerals
T2 - Colusites Cu26V2M6S32 (M = Ge, Sn)
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.
AB - 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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U2 - 10.1063/1.4896998
DO - 10.1063/1.4896998
M3 - Article
AN - SCOPUS:84907833437
VL - 105
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 13
M1 - 132107
ER -