Synergetic improvement strategy on thermoelectric performance of CuAlO2 compacts

作     者：Hao, Liang Toyama, Yuta Feng, Ningbo Jin, Yingrong Lu, Yun 

作者机构：Int Joint Res Ctr Low Carbon Green Proc Equipment Tianjin Peoples R China Tianjin Key Lab Integrated Design & On Line Monit Tianjin Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Chiba Univ Coll Mech Engn Inage Ku 1-33 Yayoi Cho Chiba 2638522 Japan Chiba Univ Grad Sch Inage Ku 1-33 Yayoi Cho Chiba 2638522 Japan Xihua Univ Sch Mat Sci & Engn 99 Jinzhou Rd Chengdu 610039 Sichuan Peoples R China 

出 版 物：《CERAMICS INTERNATIONAL》 (国际陶瓷)

年 卷 期：2019年第45卷第5期

页      面：5486-5490页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：National Natural Science Foundation of China Scientific Research Foundation of Tianjin University of Science and Technology Innovation Team Program of Tianjin University of Science and Technology 

主　　题：CuAlO2 thermoelectrics Elemental doping Density increase Orientation Control 

摘      要：We fabricated Sr and Ca-doped CuAlO2 compacts from the mixed powder of CuO, Cu2O, Al2O3, and SrO or CaO by multi-pass hot pressing followed by spark plasma sintering (SPS). The XRD results showed the reaction of CuO, Cu2O and Al2O3 was rather complete and only CuAlO2 single phase was formed when the additive amount of SrO or CaO was appropriate. Multi-pass hot pressing increased the relative density and the usage of plate-like Al2O3 as reaction raw material enhanced the orientation degree. In spite of performance improvement conflicts through elemental doping, density increase and orientation improvement, the measurement on the thermoelectric performance indicated that the electrical resistivity, Seebeck coefficient, power factor, dimensionless figure of merit (Z7) were improved to varying degrees through the synergetic action of elemental doping, density increase, and orientation control. The highest power factor and ZT of the Ca-doped CuAlO2 compacts reached 1.54 x 10(-4) W m K-2 and 0.015 at 973 K, respectively. The thermoelectric performance was higher than those of CuAlO2 at the same temperature in published work before.