Improvement of Thermoelectric Properties by Dispersing Ag2Te Grains in AgBiTe2 Matrix: Composition Effects in (AgBiTe2)1-x(Ag2Te)x.

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  • SAKAKIBARA Tsutomu
    Second Development Department, Aisin Seiki Co., Ltd. Department of Materials Science and Energy Engineering, University of Miyazaki
  • TAKIGAWA Yasuo
    Department of Electronic Engineering, Osaka Electro-Communication University
  • KAMEYAMA Akihiro
    Department of Electrical and Electronic Engineering University of Miyazaki
  • KUROSAWA Kou
    Department of Electrical and Electronic Engineering University of Miyazaki

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  • AgBiTe<sub>2</sub>マトリックスにAg<sub>2</sub>Te粒を分散させたことによる熱電特性の向上: (AgBiTe<sub>2</sub>)<sub>1-<i>x</i></sub>(Ag<sub>2</sub>Te)<sub><i>x</i></sub>の複合化効果

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Abstract

We prepare composite materials that Ag2Te grains were dispersed in AgBiTe2 matrices with the compositions of (AgBiTe2)1-x(Ag2Te)x. The textures depend on the composition. We measured electrical conductivity, thermal conductivity, Seebeck coefficients and Hall coefficients as a function of the composition. Eased on these data, we estimate Hall mobility and lattice thermal conductivity, and finally thermoelectric figure of merit. We show that the figure of merit is enhanced in the composite system by means of enhancement of phonon scattering at the grain boundaries.

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