Charge Transport and Thermoelectric Properties of (Nd1−zYbz)yFe4−xCoxSb12 Skutterudites

被引:0
|
作者
Dong-Kil Shin
Kyung-Wook Jang
Soon-Mok Choi
Soonil Lee
Won-Seon Seo
Il-Ho Kim
机构
[1] Korea National University of Transportation,
[2] Hanseo University,undefined
[3] Korea University of Technology and Education,undefined
[4] Korea Institute of Ceramic Engineering and Technology,undefined
来源
Journal of Electronic Materials | 2018年 / 47卷
关键词
Thermoelectric; skutterudite; partial double filling; charge compensation;
D O I
暂无
中图分类号
学科分类号
摘要
Partially double-filled (Nd1−zYbz)yFe4−xCoxSb12 (z = 0.25, 0.75, y = 0.8, and x = 0, 0.5, 1.0) skutterudites were prepared by encapsulated melting, annealing, and hot pressing, and the effects of Nd/Yb partial double filling and Co charge compensation on the microstructure, charge transport, and thermoelectric properties were investigated. All the specimens were transformed to the skutterudite phase together with a few secondary phases such as FeSb2, but FeSb2 formation was suppressed on increasing Co content. Nd and Yb were successfully double-filled in the voids of the skutterudite lattice and Co was well substituted at Fe sites, as indicated by changes in the lattice constant with Nd/Yb filling and Fe/Co substitution. All the specimens showed p-type conduction and exhibited degenerate semiconductor characteristics at temperatures from 323 K to 823 K, and the charge transport properties depended on the filling ratio of Nd and Yb because of the difference between the valencies of Nd and Yb. The electrical conductivity decreased and the Seebeck coefficient increased owing to a decrease in the carrier concentration with increasing Co content. The lattice thermal conductivity decreased because phonon scattering was enhanced by Nd and Yb partial double filling, but partially double-filled specimens did not exhibit a further significant reduction in the lattice thermal conductivity compared with the completely double-filled specimens. A maximum ZT of 0.83 was obtained for (Nd0.75Yb0.25)0.8Fe3CoSb12 at 723 K.
引用
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页码:3143 / 3151
页数:8
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