Ce_(1-x)Ca_xO_(2-x)的溶胶-凝胶法的合成及其性质  

Sol-gel Synthesis and Properties of Ce_(1-x)Ca_xO_(2-x) Solid Solutions

作　　者：彭程[1] 蒋凯[1] 李五聚[1] 王琳[2] 王鸿燕[2] 梁宏伟[2] 孟健[2] 

机构地区：[1]河南师范大学化学与环境科学学院 [2]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022

出　　处：《应用化学》2001年第6期428-431,共4页Chinese Journal of Applied Chemistry

基　　金：国家重点基础研究发展规划项目 (G19980 613 11);国家自然科学基金 (2 983 10 10 ;5 980 2 0 11);河南省杰出青年基金;河南省自然科学基金 (0 0 40 3 0 3 0 0 )资助课题

摘　　要：用溶胶 -凝胶法合成了 Ce1-x Cax O2 -x(x=0～ 0 .3 5 )系列固体电解质 ,系统地研究了其晶体结构随Ca O含量的变化关系 .XRD测试表明 ,该体系于 1 60℃即形成萤石结构纯相 .高温 XRD表明 ,从室温至80 0℃ ,Ce1-x Cax O2 -x(x=0～ 0 .3 5 )未出现结构相变 .此法合成温度远低于传统的高温固相合成法和水热合成法的温度 .合成物的颗粒小 ,粒度均匀 .在 1 3 0 0℃即可烧结成高致密度样品 .XPS测试表明 ,掺杂 Ca O后吸附氧浓度明显增大 ,氧空位增多 ,电导率和氧离子迁移数增大 ,改善了 Ce O2 基固体电解质的性能 .A series of solid electrolytes, Ce_1-xCa_xO_2-x(x=0~0.35), were prepared by sol-gel method. The relation of the crystal structure with the content of CaO was systematically investigated. XRD spectra showed that a pure fluorite phase was formed at 160 ℃. No phase was observed from room temperature to 800 ℃. The synthesis temperature in sol-gel method was significantly lower than in the traditional ceramic method and also lower than in the hydrothermal synthesis method. The purity of the product prepared by the sol-gel method is higher with the grain size uniformly smaller. They were easily sintered into highly dense ceramic pellets at 1 300 ℃. XPS showed that the oxygen vacancy increased obviously by doping CaO, resulting in the increase of the oxygen ionic transport number and conductivity. Therefore, the performance of ceria-based solid electrolyte was improved.

关 键 词：固体电解质 溶胶-凝胶法 氧离子导体 合成 固体氧化燃料电池 氧化铈 氧化钙 复合氧化物 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TM24[一般工业技术—材料科学与工程]