摘要
用高温熔融退火扩散法合成了富Co组成的方钴矿化合物CeyFexCo4-xSb12(y=0～0.42),并对化合物的结构和热电性能进行了研究.结果表明:化合物的晶格常数随Ce填充量的增加而线性增加.霍尔系数RH为正值,CeyFexCo4-xSb12化合物表现p型传导.载流子浓度和电导率随Ce填充量的增加而减少.Seebeck系数随Ce填充量的增加及温度的上升而增加.晶格热导率在Ce填充量约为0.29时达到最小值,说明在Sb组成的二十面体空洞中部分填充时,Ce的扰动对声子的散射作用最强.在725K时,组成为Ce0.29Fe1.41Co2.59Sb12.32化合物的最大无量纲热电性能指数达到0.65.
Cobalt-rich filled skutterudite compounds CeyFexCo4-xSb12 （ y = 0-0.42） are synthesized using the melting-diffusion method. The structure and thermoelectric properties of the compounds are investigated. Results indicate that the lattice constants increase linearly with the Ce filling fraction. Hall coefficient is positive. Hole concentration and electrical conductivity decreased as the Ce filling fraction increases. Seebeck coefficient increase with the Ce filling fraction. The lattice thermal conductivity reached the minimum value when the Ce filling fraction was about 0. 29 , indicating that the effect of Ce rattling on phonon scattering is the strongest as Sb-dodecahedron partial voids are filled by Ce. A maximum ZT value of 0.65 is obtained for Ce0.29 Fe1.41Co2.59Sb12.32 at 725K.
基金
国家自然科学基金(批准号:50372049)
国家自然科学基金重大国际合作(批准号:50310353)资助项目~~
关键词
p型方钴矿
合成
热电性能
p-type skutterudite
synthesis
thermoelectric properties
