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以 3+ 价的 Y作为填充原子,在 y=0~0.4的组成范围内, 合成了填充式方钴矿化合物YyFexCo4-xSb12,系统研究了 Y 填充分数对 p 型YyFexCo4-xSb12化合物电性能和热性能的影响。所有样品均显示为 p 型传导,随着 Y 填充分数的增加,方钴矿化合物的电导率下降;塞贝克系数随着温度的升高和Y填充分数的增加而增大,同时峰值朝低温方向移动。晶格热导率随 Y 填充分数的增加先减小后增加,在一定填充分数 y 时达到最小值。填充在 Sb 的20面体空洞中的 Ba、Ce、Y原子能显著降低其晶格热导率,且晶格热导率降低幅度按 Ba、Ce、Y离子半径减小的顺序增大。无量纲热电性能指数 ZT随温度的升高而增大,组成为Y0.08 Fe0.7 Co3.3 Sb12 的填充式方钴矿化合物在750K时其最大无量纲热电性能指数 ZT达0.7。
In this paper, YyFexCo4-xSb12 was synthesized by using 3+ valences of Y as the filling atoms in the range of y = 0-0.4. The effects of Y-filling fraction on the electrical properties and thermal properties of p-type YyFexCo4-xSb12 The impact of performance. All the samples showed p-type conduction. The conductivity of the skutterudite compound decreased with the increase of the Y-filling fraction. The Seebeck coefficient increased with the increase of the temperature and the Y-filling fraction. Meanwhile, the peak value increased toward the low temperature mobile. The thermal conductivity of the lattice decreases first and then increases with the increase of the Y filling fraction, reaching the minimum value at a certain filling fraction y. The Ba, Ce, Y atoms filled in the 20-body voids of Sb can significantly reduce the lattice thermal conductivity, and the decrease of lattice thermal conductivity increases in the order of decreasing Ba, Ce and Y ion radii. The dimensionless thermoelectric property index ZT increases with the increase of temperature, and the maximum dimensionless thermoelectric property index ZT reaches 0.7 at 750K with the composition of Y0.08 Fe0.7 Co3.3 Sb12.