Highly enhanced thermoelectric and mechanical performance of copper sulfides via natural mineral in-situ phase separation  

作　　者：Xi Yan Hongjiang Pan Yixin Zhang Tianyu Yang Yangwei Wang Kun Huang Chongyu Wang Jing Feng Zhenhua Ge 

机构地区：[1]Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《Journal of Advanced Ceramics》2024年第5期641-651,共11页先进陶瓷（英文）

基　　金：the National Key R&D Program of China(No.2022YFF0503804);the National Natural Science Foundation of China(No.52162029),the Yunnan Provincial Natural Science Key Fund(No.202101AS070015);the Basic Research Project of Yunnan Science and Technology Program(No.202401AT070403);the Outstanding Youth Fund of Yunnan Province(No.202201AV070005).

摘　　要：In situ phase separation precipitates play an important role in enhancing the thermoelectric properties of copper sulfides by suppressing phonon transmission.In this study,Cu1.8S composites were fabricated by melting reactions and spark plasma sintering.The complex structures,namely,micron-PbS,Sb_(2)S_(3),nano-FeS,and multiscale pores,originate from the introduction of FePb_(4)Sb_(6)S_(14)into the Cu1.8S matrix.Using effective element(Fe)doping and multiscale precipitates,the Cu_(1.8)S+0.5 wt%FePb_(4)Sb_(6)S_(14)bulk composite reached a high dimensionless figure of merit(ZT)value of 1.1 at 773 K.Furthermore,the modulus obtained for this sample was approximately 40.27 GPa,which was higher than that of the pristine sample.This study provides a novel strategy for realizing heterovalent doping while forming various precipitates via in situ phase separation by natural minerals,which has been proven to be effective in improving the thermoelectric and mechanical performance of copper sulfides and is worth promoting in other thermoelectric systems.

关 键 词：in situ precipitates JAMESONITE natural mineral THERMOELECTRIC copper sulfides 

分 类 号：TB34[一般工业技术—材料科学与工程]