(北京工业大学 新型功能材料教育部重点实验室, 北京100022)
摘 要: 以Co、 Sb、 Fe及Ce为起始原料， 采用放电等离子烧结(SPS)技术原位反应合成了填充式Skutterudite化合物CeyFe1.0Co3.0Sb12，并研究了该化合物的合成条件及热电性能。 实验结果表明： 当y为0~0.30时，用放电等离子烧结法在573 K开始生成CeyFe1.0Co3.0Sb12，且在673~873 K时， CeyFe1.0Co3.0Sb12化合物为主晶相，并伴有极少量的FeSb2和Sb相。 晶格常数和Seebeck系数随Ce填充分数的增加而呈线性增加， 电导率和热导率随Ce填充分数的增加而降低。 CeyFe1.0Co3.0Sb12化合物表现为P型传导， CeyFe1.0Co3.0Sb12化合物中Ce的填充分数y为0.30时， Ce0.30Fe1.0Co3.0Sb12化合物具有较高的热电性能，其中在773 K时具有最大的热电优值(ZT值)0.45。
关键字: 方钴矿; 放电等离子烧结; 电导率; 热导率; Seebeck系数
（The key Laboratory of Advanced Functional Materials，
Ministry of Education，Beijing University of Technology, Beijing 100022, China）
Abstract: The filled skutterudite CeyFe1.0Co3.0Sb12 was prepared by in-situ spark plasma sintering(SPS) technology using Co, Sb, Fe and Ce powder as materials, and the synthesis condition and thermoelectric properties were studied. The results show that the skutterudite phase appears at 573 K and becomes main phase with a small amounts of other phases such as FeSb2 and Sb, when temperature range is 673-873 K and 0<y≤0.30. All the Ce-filling compounds of CeyFe1.0Co3.0Sb12 is P-type conduction, the lattice constant and Seebeck coefficient increase with the Ce-filling increasing, while the electrical conductivity and thermal conductivity decrease. The Ce0.30Fe1.0Co3.0Sb12 compound has higher thermoelectric property when y is 0.30, the maximum value of the dimensionless figure of merit(ZT) is 0.45 at 773 K.
Key words: skutterudite; spark plasma sintering; electrical conductivity; thermal conductivity; seebeck coefficient
