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 

机构地区：[1]School of Mathematics and Physics,Anhui University of Technology [2]Institute of Optoelectronic Information Materials and Technologies,Anhui University of Technology [3]School of Materials Science & Engineering,Anhui University of Technology

出　　处：《International Journal of Minerals,Metallurgy and Materials》2014年第7期720-725,共6页矿物冶金与材料学报（英文版）

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)

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.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.

关 键 词：transition metal oxides sol-gel process THERMOELECTRICITY electrical properties SUBSTITUTION 

分 类 号：TQ132.32[化学工程—无机化工]