Structure and Mixed Electronic-ionic Conducting Properties of La_(0.6)Sr_(0.4)Co_(1-y)Fe_yO_3(y=0-1.0) Ceramics Made by a Citrate Method  

作　　者：黄端平 徐庆 

机构地区：[1]School of Materials Science and Engineering,Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2008年第1期80-84,共5页武汉理工大学学报（材料科学英文版）

基　　金：the National Natural Science Foundation of China(No.50572079);the Program for New Century Excellent Talents in University(No.NCET-04-0724);the Special Research Found for the Doctoral Program of High Education(No.20330497008);the Foundation for Innovative Research Team of Hubei Province(No.2005ABC004)

摘　　要：La0.6Sr0.4Co1-yFeyO3（y= 0-1.0） powders were synthesized by a citrate method, and the structure and mixed electronic-ionic conducting properties of the resulting ceramics were investigated. The synthesized La0.6Sr0.4Co1-yFeyO3 powders have a pure perovskite structure and consist of uniform and fine particles. A perovskite struciure with rhombohedral symmetry was certified for the La0.6Sr0.4Co1-yFeyO3 ceramics. The increase of Co/Fe ratio significantly promoted the grain growth and microstructural densification. The La0.6Sr0.4Co1-yFeyO3 compositions with relatively higher Co/Fe ratio exhibit superior mixed conducting properties. The electronic structure and microstructure of the ceramics are responsible for the variation of the mixed conducting properties with Co/Fe ratio.La0.6Sr0.4Co1-yFeyO3（y= 0-1.0） powders were synthesized by a citrate method, and the structure and mixed electronic-ionic conducting properties of the resulting ceramics were investigated. The synthesized La0.6Sr0.4Co1-yFeyO3 powders have a pure perovskite structure and consist of uniform and fine particles. A perovskite struciure with rhombohedral symmetry was certified for the La0.6Sr0.4Co1-yFeyO3 ceramics. The increase of Co/Fe ratio significantly promoted the grain growth and microstructural densification. The La0.6Sr0.4Co1-yFeyO3 compositions with relatively higher Co/Fe ratio exhibit superior mixed conducting properties. The electronic structure and microstructure of the ceramics are responsible for the variation of the mixed conducting properties with Co/Fe ratio.

关 键 词：CERAMICS OXIDES chemical synthesis microstructure electrical properties 

分 类 号：TQ174.12[化学工程—陶瓷工业]