锰酸镧结晶行为的研究  

The Crystallization Behavior of La0.8Sr0.2MnO3+x

作　　者：金灯仁[1] 魏光普[1] 吴文彪[1] 谢诒芬 潘璋敏[1] 

机构地区：[1]上海大学材料科学与工程学院

出　　处：《上海大学学报（自然科学版）》1997年第S1期180-184,共5页Journal of Shanghai University:Natural Science Edition

摘　　要：本文采用淀粉类衍生物作有机多功能酸络合剂的溶液合成法制备纳米钙钛矿Ｌａ０．８Ｓｒ０．２ＭｎＯ３＋ｘ．通过透射电镜（ＴＥＭ）和Ｘ射线衍射仪（ＸＲＤ）等分析手段，研究了在１００℃下蒸发、炭化及经４００～１３００℃不同温度下煅烧３ｈ后的显微结构和相结构变化．结果表明：钙钛矿结构Ｌａ０．８Ｓｒ０．２ＭｎＯ３＋ｘ相的形成温度为５００℃，其形成温度低的原因可能是炭化后金属离子与其它离子或基团结合力较弱因而活性高．７００℃是比较理想的煅烧温度，由此制得粉体结晶完整，且晶粒细小．晶粒尺寸２０ｎｍ左右，颗粒尺寸为１５～６０ｎｍ．The nanometer perovskite oxide La0.8Sr0.2MnO3+x was prepared by organic multifunctional acid based on a starch type of organic precursor.Xray diffraction analysis and transmission electron microscopic examination were used to investigate the crystal structrue and microstrucure changes of the samples which were charred at 100 ℃ and which were then calcined at temperatures from 400～1300 ℃.The results showed that the perovskite oxide La0.8Sr0.2MnO3+x formed after the calcination for 3 hours at 500 ℃ and the calcination for 3 hours below 700 ℃ ensured complete crystallization of the perovskite type oxide La0.8Sr0.2MnO3+x.

关 键 词：钙钛矿 结晶行为 有机多功能酸 

分 类 号：O742.8[理学—晶体学]