Effect of Fe substitution on the thermoelectric transport properties of CoSb3-based Skutterudite compound
Effect of Fe substitution on the thermoelectric transport properties of CoSb3-based Skutterudite compound
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DOI：
10.1016/j.jallcom.2006.02.003
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发表时间：
2006-12
影响因子：
6.2
通讯作者：
Jiangying Peng;Junyou Yang;Xinli Song;Yuehua Chen;Tong-jun Zhang
中科院分区：
文献类型：
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作者：
Jiangying Peng;Junyou Yang;Xinli Song;Yuehua Chen;Tong-jun Zhang
采用机械合金化-热压法合成了Co 4 − xFexSb 12（x≤1）取代Skutterudites化合物，研究了它们的热电性能，并对声子散射机制进行了讨论。在x=0.65左右有一个最大的Fe取代，所有样品都表现出p型行为。随着Fe含量的增加，取代方钴矿的电阻率和塞贝克系数均降低，热导率随着Fe取代量的增加而显著降低。结果表明，随着Fe含量的增加，合金的无量纲优值ZT增大，在773 K时，Co_（3.35）Fe_（0.65）Sb_（12）合金的ZT最大，为0.32。对热输运机制的分析表明，无序散射不是Fe取代导致晶格热导率下降的主要原因，而载流子-声子散射在重掺杂半导体中不可忽略，可能还存在其他机制。
Co4−xFexSb12(x≤1) substituted Skutterudites have been synthesized by mechanical alloying–hot pressing method, their thermoelectric properties have been investigated and phonon scattering mechanism discussed in this paper. There is a maximal Fe substitution at about x=0.65 and all samples exhibit p-type behavior. Both the electrical resistivity and Seebeck coefficient of the substituted Skutterudite decrease with increasing Fe content, and the thermal conductivity is lowered dramatically with Fe substitution. The resultant dimensionless figure of merit ZT increases with Fe substitution and a maximal ZT is obtained as 0.32 for Co3.35Fe0.65Sb12at 773K. Analysis on thermal transport mechanism reveals that disorder scattering is not the main reason for decrease of the lattice thermal conductivity with Fe substitution, while carrier–phonon scattering could not be ignored in these heavily doped semiconductors and some other mechanism may exist.