【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 .更多还原

【Abstract】 A series of solid electrolytes, Ce₁-xCa_xO₂-x（x=0⁰.35）, 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.更多还原