Thermoelectric properties of Al substituted misfit cobaltite Ca_3(Co_(1-x)Al_x)_4O_9 at low temperature

作     者：Yi Liu Hong-mei Chen Jin-lian Hu Xu-bing Tang Hai-jin Li Wei Wang 

作者机构：School of Mathematics and PhysicsAnhui University of Technology Institute of Optoelectronic Information Materials and TechnologiesAnhui University of Technology School of Materials Science & EngineeringAnhui University of Technology 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2014年第21卷第7期

页      面：720-725页

核心收录：

学科分类：081702[工学-化学工艺] 0709[理学-地质学] 0819[工学-矿业工程] 0806[工学-冶金工程] 08[工学] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financially supported by the Key Lab of Novel Thin Film Solar Cells,Chinese Academy of Sciences (No.KF201101) the Provincial Science Key Foundation of Higher Education Institutions of Anhui,China(No. KJ2011A053) the National Natural Science Foundation of China(No.51202005) 

主　　题：transition metal oxides sol-gel process thermoelectricity electrical properties substitution 

摘      要：Thermoelectric properties of Al substituted compounds Ca3（Co1-xAlx）4O9 （x=0, 0.03, 0.05）, prepared by a sol-gel process, have been investigated in the temperature range 305-20 K. The results indicate that after Al substitution for Co in Ca3（Co1-xAlx）4O9, the direct current electrical resistivity and thermopower increase due to the reduction of carrier concentration. Experiments show that Al substitution results in decreased lattice thermal conductivity. The figure of merit of temperature behavior suggests that Ca3（Co0.97Al0.03）4O9 would be a promising candidate thermoelectric material for high-temperature thermoelectric application.