无机材料学报2021，Vol.36Issue(9)：991-998,8.DOI:10.15541/jim20200698
基于熵工程及SHS动力学的BiAgSeS本征低热导率起源探究
Unveiling the Intrinsic Low Thermal Conductivity of BiAgSeS through Entropy Engineering in SHS Kinetic Process
摘要
Abstract
It is of great significance to find the ultra-rapid preparation technology of materials and realize the optimization of electroacoustic transport properties in the research of thermoelectric materials. In this study, BiAgSeS compounds were successfully prepared by self-propagating high temperature synthesis (SHS), of which the kinetic process was systematically studied. It is found that the melting of Bi is the key to activate and initiate SHS reaction. In addition, the high concentrations of nano- and atomic-scale strain field regions, and screw dislocations produced in the non-equilibrium SHS process provide an everlasting step source for material growth and make the grains possess the layered structure. In the process of material densification, the step source continues to play a role in dominating grain growth, and thus leaving nanopores at the grain boundary. Because of these defects, compared with samples via melting-quenching (MQ) combined with plasma activated sintering (PAS), the SHS+PAS samples can slightly increase the electrical conductivity and significantly reduce the lattice thermal conductivity by ～6％. Finally, the thermoelectric properties are optimized, and the ZT is improved in the whole temperature range with the maximum value of 0.5 obtained at 773 K.关键词
热电/铋银硒硫化物/熵工程/自蔓延高温合成/孤对电子Key words
thermoelectric/BiAgSeS/entropy engineering/self-propagating high-temperature synthesis/lone pair electron分类
化学化工引用本文复制引用
杨东旺,罗婷婷,苏贤礼,吴劲松,唐新峰..基于熵工程及SHS动力学的BiAgSeS本征低热导率起源探究[J].无机材料学报,2021,36(9):991-998,8.基金项目
National Natural Science Foundation of China(51872219) （51872219）
Fundamental Research Funds for the Central Universities(WUT:2020IVA097) （WUT:2020IVA097）
Funds for Postdoctoral Innovative Research Posts in Hubei Province(20201jb010) （20201jb010）
