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Synthesis and Thermoelectric Properties of Partially Double-Filled (Ce1-z Pr z ) y Fe4-x Co x Sb12 Skutterudites

  • Topical Collection: International Conference on Thermoelectrics 2017
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Abstract

Partially double-filled p-type (Ce1−z Pr z ) y Fe4−x Co x Sb12 (z = 0.25, 0.75; y = 0.8; x = 0, 0.5, 1.0) skutterudites were synthesized by encapsulated melting and consolidated by hot pressing. The microstructure, phase, charge transport characteristics, and thermoelectric properties of the hot-pressed specimens were analyzed. Detailed measurements indicated that the skutterudite phase was successfully synthesized, but a small amount of a secondary phase (FeSb2) was also identified. However, the amount of the FeSb2 phase decreased with an increase in the Co substitution. Unlike for the filled Ce1−z Pr z Fe4−x Co x Sb12 skutterudites with y = 1, the (Ce,Pr)Sb2 phases were not formed by partial filling with Ce/Pr. The electrical conductivity decreased with increasing temperature, similar to the behavior shown by degenerate semiconductors. The Hall coefficient and the Seebeck coefficients were positive, indicating that all specimens exhibited p-type characteristics. The electrical conductivity and the electronic thermal conductivity decreased with increasing Pr filling and Co substitution because of the decreased carrier concentration caused by charge compensation. A maximum dimensionless figure of merit, ZTmax = 0.84, was obtained at 623 K for (Ce0.75Pr0.25)0.8Fe3CoSb12.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea National University of Transportation, Chungju, Chungbuk, 27469, Korea

    Ye-Eun Cha, Dong-Kil Shin & Il-Ho Kim

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  1. Ye-Eun Cha
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  2. Dong-Kil Shin
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Correspondence to Il-Ho Kim.

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Cha, YE., Shin, DK. & Kim, IH. Synthesis and Thermoelectric Properties of Partially Double-Filled (Ce1-z Pr z ) y Fe4-x Co x Sb12 Skutterudites. J. Electron. Mater. 47, 3152–3158 (2018). https://doi.org/10.1007/s11664-017-5907-9

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  • DOI: https://doi.org/10.1007/s11664-017-5907-9

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