Electrical properties of Ca3-xSmxCo4O9+δceramics prepared under magnetic field  

作　　者：Xiu-Rong Qu Yan-Yan Xu Shu-Chen Lü Jian-Min Hu 曲秀荣;徐岩岩;吕树臣;胡建民(Key Laboratory of Photonic and Electric Bandgap Materials,and School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]Key Laboratory of Photonic and Electric Bandgap Materials,and School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,China [2]School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Physics B》2020年第4期344-350,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.51302055)。

摘　　要：We fabricate Sm-doped Ca3Co4O9+δ(CCO)bulk materials in magnetic field during both processes of chemical synthesis and cold pressing.The structure and electrical performance of the samples are investigated.With the increasing Sm concentration,the electrical conductivity 1/ρ decreases and the Seebeck coefficientαincreases.As a result,the power factor(PF=α^2/ρ)is raised slightly.After applying magnetic field,the extent of texture,grain size and density of all the bulk materials are improved obviously,thereby an enhanced electrical conductivity can be gained.Additionally,the degeneracy of Co^4+ state in the CoO2 layer of CCO is also increased as the magnetic field is used in the preparing process,which results in an enhancedα.The Ca2.85Sm0.15Co4O9+δ prepared in magnetic field shows the largest power factor(0.20 mW·m^-1·K^-2 at 1073 K).

关 键 词：CHEMICAL preparation magnetic field structure ELECTRICAL CHARACTERISTIC 

分 类 号：TQ174.1[化学工程—陶瓷工业]