铜业工程Issue(3)：40-46,7.DOI:10.3969/j.issn.1009-3842.2024.03.003
n型Pb1+xSeTex固溶体的自蔓延高温合成及热电性能调控
Enhanced Thermoelectric Performance of n-Type Pb1+xSeTex Prepared by Self-Propagating High Temperature Synthesis
摘要
Abstract
Thermoelectric materials have attracted much attention because they can realize the direct conversion between heat and elec-tric energy.Lead-based sulfur compounds are a class of materials with high thermoelectric conversion efficiency,and PbSe and PbTe are the representatives of this class of materials.Compared to PbTe,PbSe has more significant research value and application potential due to the higher abundance and lower cost of Se.However,its relatively high lattice thermal conductivity and low carrier concentration restrain the thermoelectric performance of PbSe.Forming solid solution can effectively reduce the lattice thermal conductivity and im-prove the thermoelectric properties.Besides,the energy band structure of PbTe and PbSe is similar,which can simplify the transport re-search.Therefore,the solid solution of PbTe and PbSe is expected to obtain higher thermoelectric properties.Current synthesis methods of PbSe,such as mechanical alloying and melt annealing,require substantial time and energy,leading to high production costs,which are not conducive to practical use.In this paper,n-type Pb1+xSeTex solid solutions were rapidly prepared by combining self-propagating high-temperature synthesis(SHS)with spark plasma sintering(SPS).Due to the optimization of carrier concentration and the effect of al-loy scattering,both electrical and thermal properties were improved.The lattice thermal conductivity reduced to 0.67 W/(m·K)at 773 K,which was 35%lower than that of pure PbSe,and figure of merit(ZT)value reached 1.1 at 773 K,which was 83%higher than that of pure PbSe.This work provided a reference for the wide application of self-propagating preparation technology in thermoelectric field.关键词
自蔓延高温合成/PbSe/Pb1+xSeTex固溶体/载流子浓度/晶格热导率Key words
self-propagating high temperature synthesis/PbSe/Pb1+xSeTex solid solution/carrier concentration/lattice thermal con-ductivity分类
能源科技引用本文复制引用
张文钰,周志方,郑云鹏,杨岳洋,南策文,林元华..n型Pb1+xSeTex固溶体的自蔓延高温合成及热电性能调控[J].铜业工程,2024,(3):40-46,7.基金项目
国家自然科学基金基础科学中心项目(52388201)资助 （52388201）
