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由于具有复杂的晶体结构和超离子导体行为,金属硫属化合物特别是Cu2-xSe在热电领域得到了广泛的关注.本文报道了一种简单易行的提高热电效率的方法:在基体材料Cu2-xSe中添加纳米Zn Te插层,用来提高Cu2-xSe材料的热电性能.实验结果表明,Cu2-xSe-Zn Te复合材料的电导率提高了32%,电导率的增加牺牲了塞贝克系数,导致复合材料的功率因子稍微低于纯Cu2-xSe基体材料;第二相的引入抑制了晶格热扩散,使得Cu2-xSe-Zn Te复合材料的热导率降低了34%.由此可知,适中的功率因子和较低的热导率致使含有10 wt.%Zn Te的Cu2-xSe-Zn Te复合材料在中温条件(750 K)下的z T值提高至0.40,相比于纯Cu2-xSe基体材料该数值提高了40%.因此,向Cu2-xSe材料中添加纳米Zn Te插层,是提高Cu2-xSe基材料热电性能的一个有效途径.
Metallic chalcogenides, especially Cu2-xSe, have attracted a great deal of attention in the field of thermoelectric power because of their complex crystal structure and super-ionic conductor behavior.In this paper, a simple and easy method to improve the thermoelectric efficiency is reported: The results show that the electrical conductivity of Cu2-xSe-Zn Te composites increases by 32%, the Seebeck coefficient is sacrificed by the increase of electrical conductivity, and the thermal conductivity of Cu2-xSe- Resulting in the power factor of the composite being slightly lower than that of the pure Cu2-xSe matrix. The introduction of the second phase restrained the lattice thermal diffusion and reduced the thermal conductivity of the Cu2-xSe-Zn Te composite by 34% The moderate power factor and lower thermal conductivity resulted in the zT value of Cu2-xSe-ZnTe composite containing 10 wt.% Zn Te increased to 0.40 at moderate temperature (750 K), compared to pure Cu2- The value of xSe matrix material is increased by 40% .Therefore, adding nano-ZnTe intercalation to Cu2-xSe material is an effective way to improve the thermoelectric properties of Cu2-xSe matrix material.