Abstract: Homogenous coprecipitation of Ce3+，Y3+ was performed to prepare (Ce0.8Y0.2)2(C2O4)3 solid solution，by using diethyl oxalate，cerium nitrate and yttrium nitrate as starting materials，and urea as pH adjuster. The co-precipitates produced under different conditions were analyzed by TG-DTA and the result indicated that the co-precipitates （n=0～35.5，n：mole ratio of urea to diethyl oxalate） produced were oxalate solid solution. From SEM observation its particle average size decreased from 10μm to 0.5μm with increasing n from 0 to 35.5. The oxides derived from the oxalate solid solutions were confirmed to be Y-doped CeO2 by XRD analysis and lattice constant calculation. Its crystallite size is about 10nm.

摘要： 以草酸二乙酯、Ce(NO3)3·6H2O、Y(NO3)3·6H2O为初始原料，以尿素为pH值调节剂，实现了Ce3+、Y3+的均相共沉淀。利用热重分析（TG-DTA）从多方面证实了n=0～35.5（n为尿素与草酸二乙酯的摩尔比）范围内得到的沉淀物为草酸铈的固溶体。经扫描及透射电子显微镜观察，生成的草酸盐固溶体沉淀颗粒尺寸随着n值的增大而减小，由n＝0时约10 μm下降到n=35.5时约0.5 μm，沉淀物热分解后得到的氧化物经X射线衍射分析及晶格常数计算表明了为Y固溶CeO2，其结晶粒径约10 nm。