イオン液体との複合構造を持つ(Bi, Sb)2Te3系熱電変換材料の作製とその熱電特性の評価

勝山 茂; 草深 佑介; 平井 信充; 鈴木 賢紀; 田中 敏宏

doi:10.2497/jjspm.59.201

Paper

Synthesis of (Bi, Sb)₂Te₃-based Thermoelectric Material Composited with Ion Liquid and Investigation of its Thermoelectric Properties

Shigeru Katsuyama, Yusuke Kusafuka, Nobumitsu Hirai, Masanori Suzuki, Toshihiro Tanaka

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Keywords: thermoelectric material, ion liquid, composite, electrical resistivity, thermal conductivity

JOURNAL OPEN ACCESS

2012 Volume 59 Issue 4 Pages 201-205

DOI https://doi.org/10.2497/jjspm.59.201

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Abstract

The composite of (Bi_0.3Sb_0.7)₂Te₃ and ion liquid, BMImTFSI, was synthesized by the immersion of the ion liquid to the pores of the porous sintered (Bi_0.3Sb_0.7)₂Te₃, and its microscopic structure and thermoelectric properties were investigated. The Seebeck coefficient of the composite is smaller than that of the porous sintered (Bi_0.3Sb_0.7)₂Te₃, while the electrical resistivity of the composite is a little larger. The thermal diffusivity of the composite is smaller than that of the porous sintered (Bi_0.3Sb_0.7)₂Te₃, which seems to indicate that the interface between the ion liquid and the crystal grain of (Bi_0.3Sb_0.7)₂Te₃ can be effective for the enhancement of the phonon scattering. As a result, the dimensionless figure of merit ZT of the composite shows the smaller value than the porous sintered (Bi_0.3Sb_0.7)₂Te₃.

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