【摘要】 采用硝酸盐-柠檬酸法制备了Ce0.8Sm0.2O1.9(简称SDC)纳米粉体.XRD分析表明,不同温度下焙烧所合成的SDC均属于立方萤石结构,晶粒平均粒径在5.4~24.3nm,TEM结果显示SDC纳米粉成球形,晶粒尺寸分布均匀.粒度分布测试结果显示,此方法制备的SDC粉体活性较高,存在明显的团聚现象.TGA-DSC结果显示在400℃基本完成干凝胶的分解.800℃焙烧2 h的粉体的烧结曲线显示自641.1℃开始烧结收缩,在1 300℃烧结2 h坯体收缩11.7%.1 400℃烧结10 h的SDC固体电解质在600℃和800℃电导率分别为0.020 1和0.197 S.cm-1,离子导电活化能为104.2 kJ.mol-1,在氢气气氛下总电导率约为空气气氛的2倍.更多还原

【Abstract】 Ce_0.8Sm_0.2O_1.9（SDC） nano powders were synthesized by nitrate-citric acid method.XRD patterns show that SDC powders calcined at various temperatures have a cubic fluorite structure,and the average grain size is between 5.4～24.3 nm.TEM results reveal that SDC particles are spherical in shape and have even grain size distribution.Particle size distribution shows that there exists obvious aggregation in SDC powder system for its high activity.TGA-DSC results show that the decomposition process of dried gel can be finished below 400 ℃.For SDC powder calcined at 800 ℃ for 2 h,the sintering shrinkage begins at 641.1 ℃ and the total shrinkage is about 11.7% after sintered at 1 300 ℃ for 2 h.The conductivity of SDC solid electrolyte sintered at 1 400 ℃ for 10 h is 2.02×10^-2S·cm^-1 and 0.197 S·cm^-1 at 600 ℃ and 800 ℃ respectively,and the ionic conducting activation energy is 104.2kJ·mol^-1.The conductivity in hydrogen is about two times of that in air.更多还原