n型(AgSbTe_2)_x(PbTe)_(1-x)热电材料的制备和性能

Preparation and Properties of n-type(AgSbTe_2)_x(PbTe)_(1-x) Thermoelectric Material

采用熔融缓冷法制备了组成为(AgSbTe2)x(PbTe)1-x(x=0.04—0.20)的热电材料,研究了AgSbTe2固溶量对材料微观结构和热电传输性能的影响。结果表明,当AgSbTe2固溶量增大时,样品易发生相结构偏析,样品由富Pb和富AgSb的两相组成。样品热导率随AgSbTe2固溶量增加而降低,电性能也有一定程度的降低。样品的无量纲热电优值(ZT)随AgSbTe2固溶量的减小而增加。

（AgSbTe2）x（PbTe）1-x（x =0.04-0.20） samples were prepared by slow-cool-from-melts and the influences of AgSbTe2 content on the microstructure and thermoelectric properties were investigated. Results indicated that phase segregation occurs as x increases and the samples are characterized by a N-phased material containing one main Pb-rich phase and another Ag-Sb-rich phase. As AgSbTe2 content increases, the thermal conductivity is depressed and the electrical properties decrease to some extent. The dimensionless of figure of merits （ZT） is greater for sample with a lower AgSbTe2 content.