Synthesis-temperature-dependent phase composition manipulation toward high thermoelectric performance in tetrahedrites  

作　　者：Yiqing Wei Jiaqi Liu Zien Cheng Pengfei Jiang Zizhen Zhou Bin Zhang Guoyu Wang Guang Han Xu Lu Xiaoyuan Zhou 

机构地区：[1]Center of Quantum Materials and Devices,College of Physics,Chongqing University,Chongqing 401331,China [2]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [3]College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331,China [4]Analytical and Testing Center,Chongqing University,Chongqing 401331,China

出　　处：《Journal of Materials Science & Technology》2024年第1期124-130,共7页材料科学技术（英文版）

基　　金：supported by the National Natu-ral Science Foundation of China(Grant Nos.52125103,52071041,52271202,and 12274044).

摘　　要：Tetrahedrite,an Earth-abundant natural mineral,has attracted extensive research interest because of its excellent thermoelectric performance.Herein,tetrahedrite samples comprising Cu-poor Cu_(12)Sb_(4)S_(13)and Cu-rich Cu_(14)Sb_(4)S_(13)phases have been synthesized using a colloidal method,in which the ratio of two phases is manipulated by controlling the synthesis temperature to improve the thermoelectric perfor-mance.It is found that an ultralow total thermal conductivity of∼0.3 W m^(−1)K^(−1)at 723 K is realized in the sample with a Cu-rich phase fraction of∼50%,which can be attributed to maximized phonon scattering by phase boundaries.As a result,combined with a decent power factor,this sample obtains an optimal zT of 1.15,which is about 85%higher than that of the sample with a Cu-rich phase fraction of∼64%and comparable to zT values of other eco-friendly,abundant Cu-based thermoelectric materials.This work demonstrates an effective synthesis-temperature-dependent phase composition manipulation strategy toward enhanced thermoelectric performance in tetrahedrites.

关 键 词：TETRAHEDRITE THERMOELECTRIC Colloidal method Phase manipulation Thermal conductivity 

分 类 号：TB3[一般工业技术—材料科学与工程]