Effect of samarium filling on the lattice thermal conductivity of skutterudite materials |
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| Authors: | Yiping JIANG Xiaopeng JIA Le DENG Hong'an MA |
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| Affiliation: | JIANG Yiping 1, JIA Xiaopeng 2, DENG Le 2, MA Hong’an 2 (1. Department of Physics, Beihua University, Jilin 132013, China; 2. National Lab of Superhard Materials, Jinlin University, Changchun 130012, China) Received 15 August 2011; revised 20 October 2011 |
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| Abstract: | Sm-filled skutterudites SmxCo4Sb12 (x=0.1, 0.2, 0.5) were synthesized via high pressure and high temperature (HPHT) technique. The temperature dependences of electrical resistivity, Seebeck coefficient and thermal conductivity were measured on these compounds in the range of 300-723 K. All samples showed n-type conduction. The thermal conductivity of SmxCo4Sb12 was significantly depressed as com-pared to unfilled CoSb3. It was believed that Sm atoms "rattled" in the voids of structure and substantially affected the phonon propagation through the lattice. The dimensionless thermoelectric figure of merit, ZT, increased with increasing temperature and reached a maximum value of 0.81 for Sm0.5Co4Sb12 at 723 K. |
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| Keywords: | thermal properties high-pressure X-ray diffraction rare earths |
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