日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
論文
Al–Cu–Ir系近似結晶の熱電特性
北原 功一高際 良樹木村 薫
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2018 年 82 巻 6 号 p. 188-196

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Thermoelectric properties of a cubic quasicrystalline approximant in Al–Cu–Ir system were investigated experimentally and theoretically. A homogeneous sample with no secondary phase was synthesized using an arc-melting and a spark-plasma-sintering processes followed by heat treatment at 1173 K, and its thermoelectric properties were measured at temperatures between 373 K and 1023 K. Theoretical calculations of the thermoelectric properties were performed under three different approximations, i.e., constant-relaxation-time, constant-mean-free-path, and constant-diffusion-coefficient approximations, for the energy dependence of the relaxation time of the electrons. The experimental Seebeck coefficient was well reproduced, and physically acceptable lattice thermal conductivity was estimated only under constant-diffusion-coefficient approximation for the present material. Thermoelectric figure of merit zT of the present sample was lower than 0.1, and the maximum value of zT ≈ 0.3 achievable by electron doping was predicted by the theoretical calculation under the rigid-band approximation.

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