草酸共沉淀制备超细Ce_(0.8)Sm_(0.2)O_(1.9)工艺优化  

Optimization Preparation of Ce_(0.8)Sm_(0.2)O_(1.9) by Oxalate Coprecipitation

作　　者：孙明涛[1] 孙俊才[1] 季世军[1] 

机构地区：[1]大连海事大学材料工艺研究所,辽宁大连116026

出　　处：《稀土》2005年第3期1-4,18,共5页Chinese Rare Earths

基　　金：国家"863"计划项目资助(2001AA515080)

摘　　要：掺杂铈基电解质由于具有高电导率用于中温固体氧化物电解质材料。实验采用草酸盐共沉淀法制备20%(摩尔分数)Sm2O3掺杂CeO2(Ce0.8Sm0.2O1.9)氧化物粉末,采用XRD、SEM分析粉末的相结构和颗粒形貌,500℃～1000℃煅烧草酸沉淀物,得到氧化物粉末。XRD分析结果表明,Ce0.8Sm0.2O1.9为立方萤石结构,表明在低温合成了纯相的Sm2O3掺杂CeO2固溶体。激光粒度分析仪分析沉淀反应过程中草酸盐沉淀物和氧化物粉末的粒度分布。通过优化沉淀反应pH值、溶液浓度、添加表面活化剂及沉淀物水洗和干燥处理等制备工艺条件,实现对沉淀反应过程中草酸沉淀物的团聚控制,得到分散良好的亚微米草酸共沉淀物,进一步选择合适煅烧温度,得到亚微米级超细Ce0.8Sm0.2O1.9粉末。The ultra-fine Sm-doped ceria Ce_(0.8)Sm_(0.2)O_(1.9) was prepared by oxalate coprecipitation process. The result of XRD shows that cubic phase of Ce_(0.8)Sm_(0.2)O_(1.9) was formed in the powder calcinated at 500-1000℃ high purity solid solution phase was synthesized at low temperature. The particle sizes and distributions of oxalate precipitate and powder were determined by using laser particle size analyzer. The size and agglomeration can be controlled and well dispersed ultra fine oxalate precipitate were obtained by optimizing fabrication condition, such as reaction pH value, oxalic acid concentration, adding surfactant, washing treatment and dry temperature of oxalate precipitate. Finally,the ultra fine Ce_(0.8)Sm_(0.2)O_(1.9) powder was obtained by heating oxalate precipitate at the optimal calcination temperature.

关 键 词：固体电解质 掺杂CeO2 草酸共沉淀 

分 类 号：TQ133.3[化学工程—无机化工]