Crystal Structures and Thermoelectric Properties of Sm-Filled Skutterudite Compounds Sm_yFe_xCo_(4-x)Sb_(12)  

作　　者：刘桃香 唐新峰 谢文杰 鄢永高 张清杰 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology

出　　处：《Journal of Rare Earths》2007年第6期739-743,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (50372049);the Major International Cooperation Program of the National Natural Science Foundation of China (50310353)

摘　　要：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.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.

关 键 词：skutterudite compound thermoelectric properties Sm filling rare earths 

分 类 号：TG111[金属学及工艺—物理冶金]