凝胶注模制备La_(0.8)Sr_(0.2)MnO_3多孔阴极材料  

Preparation of Porous La_(0.8)Sr_(0.2)MnO_3 Cathode Materials by Gelcasting Technology

作　　者：李国军[1] 任瑞铭[1] 刘小光[2] 仝建峰[2] 陈大明[2] 

机构地区：[1]大连交通大学,辽宁大连116028 [2]北京航空材料研究院,北京100095

出　　处：《稀有金属材料与工程》2005年第2期244-247,共4页Rare Metal Materials and Engineering

基　　金：辽宁省博士启动基金(20031061)资助;大连交通大学校科研启动基金资助

摘　　要：采用凝胶注模技术原位合成造孔剂制备出开孔气孔率为20%～30%的La0 8Sr0.2MnO3多孔阴极材料.结果表明,合适的烧结温度为1 100℃～l150℃;开口气孔位于三角晶界,中位孔径约为400 nm;多孔材料的电导率随着温度的升高而升高,由ln(σT)～l/T曲线,可得电导活化能Ea为10.99 kJ/mol.The porous La0.8Sr0.2MnO3 cathode materials were prepared by gelcasting technology and in situ synthesizing pore-produced matter. The proper sintering temperature of the porous materials prepared is 1 100degreesCsimilar to1 150degreesC for 4 h. The fracture model is transgranular fracture owing to the mismatch of thermal expansion coefficient of the various grain axes. The pores, whose median size is about 400 nm, are located at triple boundary. The conductivity of porous materials increased with increasing temperature. According to ln(sigmaT)similar tol/T curves, E-a was calculated to be 10.99 kJ/mol.

关 键 词：凝胶注模 原位 LA0.8SR0.2MNO3 多孔 电性能 

分 类 号：TQ174[化学工程—陶瓷工业]