Study on reaction mechanism of low temperature preparation of nanocrystalline LaCoO_(3-λ)

作     者：沈海云 杨秋华 李宁 

作者机构：Department of Chemistry School of Science Tianjin University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2008年第26卷第5期

页      面：681-683页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the National Natural Science Foundation of China (20671069) 

主　　题：perovskite nanocrystalline synthesis mechanism rare earths 

摘      要：Perovskite-type oxide nanocrystalline LaCoO3-λ was prepared using the citrate method. The structure and morphology of the sampies were characterized by powder X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The intermediate products were analyzed by thermal gravimetric and differential thermal analysis （TG-DTA） technology. The results showed that nanocrystalline LaCoO3-λ with a granula of 30-50 nm had a cubic perovskite structure. The reaction mechanism of low temperature preparation was suggested as follows： the metal complex was first formed by the combination of metal ion and citric acid; and then it decomposed into an aconitic acid complex, followed by an oxycarbonate, and finally a perovskite-type oxide.