中文摘要：

采用放电等离子烧结（sps）技术在800～1000K温度范围内，原位反应合成了以ce，La作为填充原子及Ni，Fe作为置换原子的填充式方钴矿化合物REy（Fe／Ni）xCO4xsb12（x=0～1．0，y=0～0．4）。系统研究了填充原子的种类、填充方式以及置换原子的种类对晶格热导率及热电性能的影响。结果表明，在Co位置上Fe或Ni的置换，能显著降低其晶格热导率，与Fe相比，Ni对晶格热导率的影响更显著。在Skutterudite结构sb组成的二十面体空洞填充ce，La原子可以显著降低其晶格热导率，在填充分数相同时，两种稀土原子复合填充较单一原子填充更能有效降低晶格热导率。电导率随ce，La填充分数的增加而降低，Seebeck系数随填充分数的增加而升高。填充分数为0．3的ce0.1La0.2FeCo3Sb12化合物具有最低的晶格热导率和最大的zT值，在800K时达0．6左右。

英文摘要：

The filled skutterudite compounds REy（Fe/Ni）xCo4-xSbl2 （x=0-1.0, y=0-0.4） were synthesized by solid state reaction and Spark Plasma Sintering （SPS） at 800-1000 K using the powders of Co, Sb, Fe, Ni and rare earth Ce and La as precursors. The effects of the kinds of filling and replacement atoms and the form of filling on the lattice thermal conductivity and thermo-electric property were discussed in this paper. The results indicate that the thermoconductivity is remarkably reduced by substituting Co with Ni and Fe, and Ni has a better effect on thermoconductivity in contrast with Fe. In addition, the lattice thermal conductivity is obviously decreased by filling with rare earth Ce and La into the Skutterudite structure. The decrease of lattice thermal conductivity is more effective by double fillings of Ce and La than single filling for the same filling fraction. The electric conductivity is decreasing and the Seebeck coefficient is increasing with the filling fraction of Ce and La increasing. The Skutterudite compound Ce0.1La0.2FeCo3Sb12 possesses the minimum thermal conductivity and the highest Seebeck coefficient with the highest ZT value of 0.6 at 800 K.