Materials Transactions Online

Materials Transactions, Vol.57 No.12 (2016) pp.2153-2157
© 2016 The Japan Institute of Metals and Materials

Effect of Mechanical Alloying on Thermal Conductivity of Bi2Te3-Sb2Te3

Masato Kitamura1 and Kazuhiro Hasezaki2

1Graduate School of Advanced Technology and Science, Tokushima University, Tokushima 770-8506, Japan
2Department of Mechanical Science, Graduate School of Technology and Science, Tokushima University, Tokushima 770-8506, Japan

A Bi2Te3-Sb2Te3 solid solution was prepared by mechanical alloying (MA) followed by hot pressing (HP). X-ray diffraction indicated that all samples which were removed at a depth below the surface of approximately 1 mm were single-phase and isotropic Bi2Te3-Sb2Te3 solid solution. Reduction of the phonon thermal conductivity as a result of the fine-grains caused by MA predominated over the solid-solution effect caused by melt growth. The Seebeck coefficient and electrical and thermal conductivities fluctuated between those for (Bi2Te3)0.15(Sb2Te3)0.85 and (Bi2Te3)0.2(Sb2Te3)0.8 at room temperature. A (Bi2Te3)0.15(Sb2Te3)0.85 solid solution with a dimensionless figure of merit ZT = 1.16 at 367 K was obtained by MA-HP. These results indicate that the maximum ZT of the Bi2Te3-Sb2Te3 solid solution obtained by MA-HP was not restricted to a composition of (Bi2Te3)0.25(Sb2Te3)0.75, which has the minimum phonon thermal conductivity in the case of melt growth.


(Received 2016/05/13; Accepted 2016/09/20; Published 2016/11/25)

Keywords: eco-materials, powder metallurgy, mass difference scattering, grain boundary scattering

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