机械合金化结合高压烧结制备PbSe-PbS固溶体合金的热电性能

Thermoelectric Properties of PbSe-PbS Solid Solutions Prepared by Mechanical Alloying Method and High Pressure Sintering

硒化铅(PbSe)作为一种无碲热电材料受到广泛关注。采用机械合金化结合高压烧结方法制备了PbSe-PbS固溶体合金(PbSe1–x Sx),并研究了Se/S含量对其结构和热电性能的影响。结果表明:采用机械合金化法能够快速合成出PbSe1–x Sx固溶体合金粉末,高压烧结实现了其快速致密化;通过调整Se/S比例可以实现PbSe1–x Sx电输运性能和导电类型的调控;固溶体合金能够实现短波声子散射,显著降低PbSe材料的热导率;当x=0.5、温度为600 K时,PbSe1–x Sx的最高品质因子达到0.54,比PbSe的品质因子(0.33@450K)高64%。

Lead selenide(PbSe)has received extensive attention in recent years as a non-tellurium thermoelectric material.In this paper,PbSe-PbS solid solution alloys(PbSe1–xSx)were prepared by mechanical alloying combined with high pressure sintering method.The influence of Se/S content on its structure and thermoelectric properties was studied.The results demonstrate that the mechanical alloying method can rapidly synthesize PbSe1–xSx solid solution alloy powder,and achieve rapid densification by high pressure sintering.The electrical transport properties and conductivity type of PbSe1–xSx powder can be controlled by adjusting the Se/S ratio; solid solution alloy can realize short-wave phonon scattering,which significantly reduces the thermal conductivity of PbSe material.When x = 0.5 and the temperature is 600 K,the highest quality factor of PbSe1–xSx is 0.54,which is 64% higher than that of PbSe(0.33@450 K).