烧结助剂Co_2O_3对Ce_(0.8)Gd_(0.2)O_(1.9)性能的影响  

Effects of sintering additives of Co_2O_3 on properties of Ce_(0.8)Gd_(0.2)O_(1.9)

作　　者：赵艳琴[1] 吴印林[2] 周会珠[2] 戴磊[1] 李跃华[1] 王岭[1] 

机构地区：[1]河北理工大学化工与生物技术学院,河北唐山063009 [2]河北理工大学教务处,河北唐山063009

出　　处：《功能材料》2008年第9期1477-1479,1482,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50772030;50572024);唐山市科技局资助项目(0436001B-10)

摘　　要：采用传统固相反应法制备陶瓷试样，借助EIS、XRD及SEM等技术手段研究了烧结助剂Co2O3对Ce0.8Gd0．2O1.9（CGO）的体密度、导电性能、相组成及微观结构的影响。结果表明，当CGO中添加2．59，6（质量分数）Co2O3时，可使CGO试样的烧结温度降低200℃。添加0．75％（质量分数）Co2O3时，试样的晶粒电导率明显增大，晶界电导率下降，添加量为1．0%～2．5％（质量分数）时，晶粒电导率趋于不变，晶界电导率稍微有所增加。XRD图谱表明，试样在1100～1200℃烧结时表现为CGO纯相，在1300～1400℃的较高温度烧结时，为CGO相及少量的Ce24Co11相。Ceo.8 Gd0.2 O1.9 ceramic samples were prepared by solid state reaction. The effects of sintering additives of Co2O3 on the bulk density, conduction properties, phase structure and microstructures of Ce0.8Gd0.2O1.9 were investigated by EIS, XRD and SEM. The results show that Co2O3 is very effective as a sintering additive. When doped with 2.5wt% Co2O3, the sintering temperature of CGO sample can be reduced by 200℃. Addition of 0.75wt% Co2O3 can increase bulk conductivity of CGO, while grain boundary conductivity reduces. When doping contents of Co2O3 is from lwt% to 2.5wt%, bulk conductivity approaches constant, but grain boundary conductivity has a little enhance. XRD results indicate that CGO-Co samples sintered at 1100-1200℃, is pure phase; while samples sintered at 1300-1400℃,contains a small amount of Ce24Co1l phase besides CGO phase.

关 键 词：CGO 烧结助剂 Co2O3 电导率 

分 类 号：TB33[一般工业技术—材料科学与工程]