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用高温熔融法合成了Ca和Ce复合填充的单相p型CamCenFexCo4-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CamCenFexCo4-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CamCenFexCo4-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.
The single-phase p-type CamCenFexCo4-xSb12 compound filled with Ca and Ce was synthesized by high temperature melting method, and the effect of the two kinds of atoms on the thermoelectric properties was explored.The results show that when the filling fraction is the same, Ca and Ce The carrier concentration and conductivity of the p-type CamCenFexCo4-xSb12 compound filled with atoms are between that of the single Ca-Ca or Ce-filled atoms and decrease with the increase of the atomic filling fraction m + n. The coefficient increases with the increase of the total atomic filling amount of two atoms, especially the Ce filling fraction m and the temperature rise. At the same filling fraction, the lattice thermal conductivity of the p-type CamCenFexCo4-xSb12 compound filled with two atoms is more than that of Ca Or Ce atom-alone compound has a low lattice thermal conductivity, and when the total filling fraction m + n is about 0.3 and the filling amounts of Ca and Ce are approximately equal, the lattice thermal conductivity of the compound is the lowest. The maximum thermoelectric performance index ZT of Ca0.18Ce0.12Fe1.45Co2.55Sb12.21 compounds reached 1.17 at 750K.