Ca和Ce双原子复合填充p型CamCenFexCo4－xSb12化合物的合成及热电性能

用高温熔融法合成了Ca和Ce复合填充的单相p型Ca_mCe_nFe_{xCo4-xSb12化合物，探索了两种原子复合填充对其热电性能的影 响规律.研究结果表明，填充分数相同时，Ca和Ce两种原子复合填充的p型CamCe nFexCo4-xSb12化合物的载流子浓度和电 导率介于Ca或Ce一种原子单独填充的化合物之间，且随两种原子填充分数m+n的增加而降低 ；赛贝克系数随两种原子填充总量，尤其是Ce填充分数m的增加以及温度的上升而增加；在 相同填充分数时，两种原子复合填充的p型CamCenFexC o4-xSb12化合物的晶格热导率较Ca或Ce一种原子单独填充的化合物 的晶格热导率低，当总填充分数m+n为0.3左右，且Ca和Ce的填充量大致相等时，化合物的晶 格热导率最低.p型Ca0.18Ce0.12Fe1.45Co2.55Sb12.21化合物的最大热电性能指数ZT值在750K时达到1.17. 关键词： skutterudite化合物 双原子复合填充 合成 热电性能}

Synthesis and thermoelectric properties of dual-atom filled p-type CamCenFexCo4-xSb12 compounds

The single-phase dual-atom filled p-type Ca_mCe_nFe_{xCo4-xSb12 compounds were synthesized by melting reactio n method. Effects of Ca and Ce filling fraction on the thermoelectric properties of the p-type CamCenFexCo4-xSb 12 were investigated. Our results indicate that with the same filling frac tion, carrier concentration and electrical conductivity of p-type Cam CenFexCo4-xSb12 intervene between t hat of single atom filled compounds CamFexCo4-x Sb12 and CenFexCo4-xSb12, and decreased with increasing Ca and Ce, especially Ce, filling fraction. With the same filling fraction, the lattice thermal conductivity of CamCe< sub>n}Fe_xCo_4-xSb₁₂ is smaller than that of Ca_mFe_xCo_4-xSb₁₂ and Ce_nF e_xCo_4-xSb₁₂. Furthermore, when the total fillin g fraction (m+n) is about 0.3 and the filling fractions of Ca and Ce are approxi mately equal, the lattice thermal conductivity is the smallest. The greatest ZT value of 1.17 was obtained at 750K for p-type Ca_0.18Ce_0.12 Fe_1.45Co_2.55Sb_12.21.