Characterization and Thermoelectric Properties of La0.4Ni0.2Co3.8Sb12 Filled Skutterudite Prepared by the MA-HP Method

Authors

  • Junyou Yang,

    Corresponding author
    1. State Key Laboratory of Materials Processing and Die & Mould Technologies, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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  • Yuehua Chen,

    1. State Key Laboratory of Materials Processing and Die & Mould Technologies, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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  • Wen Zhu,

    1. State Key Laboratory of Materials Processing and Die & Mould Technologies, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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  • Siqian Bao,

    1. State Key Laboratory of Materials Processing and Die & Mould Technologies, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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  • Xi'an Fan Xingkai Duan

    1. State Key Laboratory of Materials Processing and Die & Mould Technologies, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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  • M. Parans Paranthaman—contributing editor

  • This work is co-financed by the Prophasic Project of National Key Basic Research Program (2004CCA03200) and the Natural Science Foundation of China (Grant No. 50401008).

†Author to whom correspondence should be addressed. e-mail: jyyang@mail.hust.edu.cn

Abstract

La0.4Ni0.2Co3.8Sb12 filled skutterudite compound was successfully prepared via the route of mechanical alloying and hot pressing (MA-HP). Single-phase filled skutterudite can be obtained when the mechanically alloyed powders is hot pressed for 2 h at a temperature higher than 550°C. Prolonging the hot pressing process, the electrical resistivity of the La0.4Ni0.2Co3.8Sb12 filled skutterudite decreases; Seebeck coefficient increases when the hot press duration is prolonged from 2 to 4 h, and no evident change was observed on further prolonging. A composite microstructure, which consists of some coral-like clusters and a nanocrystalline matrix with grain size about 50 nm in the La0.4Ni0.2Co3.8Sb12 filled skutterudite, was observed for the first time. The coral-like microstructure is thought to be the prime filled skutterudite phase produced directly by MA, while nanocrystalline matrix is the filled skutterudite phase formed during hot press.

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