Crystal Structures and Thermoelectric Properties of Sm-Filled Skutterudite Compounds SmyFexCo4-xSb12
来源期刊：JOURNAL OF RARE EARTHS2007年第6期
论文作者：Yan Yonggao Liu Taoxiang Xie Wenjie Zhang Qingjie Tang Xinfeng
Key words：skutterudite compound; thermoelectric properties; Sm filling; rare earths;
Abstract: Polycrystalline samples of Sm partially filled skutterudites SmyFexCo4-xSb12 were prepared by melting and Spark Plasma Sintering technique.The results of Rietveld refinement showed that the obtained SmyFexCo4-xSb12 samples possessed filled skutterudite structures.The thermal parameter (B) of Sm is larger than that of Sb, Fe, and Co, indicating that Sm "rattled" in Sb-icosahedron voids.The effects of filling atom Sm on thermoelectric properties of these compounds were investigated.With the increase of Sm filling fraction (y), electrical conductivity decreased, Seebeck coefficient increased and had a maximum value when y was 0.38; thermal conductivity reduced and had a minimum value when y was 0.32.At 750 K, the highest figure of merit of 0.68 was obtained for Sm0.32Fe1.47Co2.53Sb12.
Yan Yonggao1，Liu Taoxiang1，Xie Wenjie1，Zhang Qingjie1，Tang Xinfeng1
(1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)
Abstract:Polycrystalline samples of Sm partially filled skutterudites SmyFexCo4-xSb12 were prepared by melting and Spark Plasma Sintering technique.The results of Rietveld refinement showed that the obtained SmyFexCo4-xSb12 samples possessed filled skutterudite structures.The thermal parameter (B) of Sm is larger than that of Sb, Fe, and Co, indicating that Sm "rattled" in Sb-icosahedron voids.The effects of filling atom Sm on thermoelectric properties of these compounds were investigated.With the increase of Sm filling fraction (y), electrical conductivity decreased, Seebeck coefficient increased and had a maximum value when y was 0.38; thermal conductivity reduced and had a minimum value when y was 0.32.At 750 K, the highest figure of merit of 0.68 was obtained for Sm0.32Fe1.47Co2.53Sb12.
Key words:skutterudite compound; thermoelectric properties; Sm filling; rare earths;
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