MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Mechanical Alloying on Thermal Conductivity of Bi2Te3-Sb2Te3
Masato KitamuraKazuhiro Hasezaki
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2016 Volume 57 Issue 12 Pages 2153-2157

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Abstract

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.

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© 2016 The Japan Institute of Metals and Materials
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