溶胶-凝胶法合成纳米铬酸锶镧的工艺研究  

Synthesis of Nanocrystalline La_(1-x)Sr_xCrO_3 by Sol-Gel Method

作　　者：赵新明[1] 敖青[1] 李胜利[1] 孙良成[1] 

机构地区：[1]山东大学材料科学与工程学院,山东济南250061

出　　处：《中国稀土学报》2005年第2期162-165,共4页Journal of the Chinese Society of Rare Earths

基　　金：山东省自然科学基金(Y2001F11);国家自然科学基金(50362001)资助项目

摘　　要：以硝酸镧、硝酸铬、硝酸锶为原料,乙二醇为分散剂,柠檬酸为胶溶剂,用溶胶凝胶法合成纳米级的铬酸锶镧粉体。利用TG,DSC,XRD分析研究了粉料的晶化过程。利用HREM分析了煅烧温度、含锶量对粉料粒径的影响。研究表明,获得纳米晶的最佳烧结温度在800℃。随着锶掺杂量的增加,粉料的粒径逐渐变小。The nanocrystalline La_(1-x)Sr_xCrO_3 was prepared by sol-gel method using La(NO_3)_3·6H_2O, (Sr(NO_3)_2) and Cr(NO_3)_3·9H_2O. Ethylene glycol and citric acid were used to be dissolvent and peptizer respectively. The phase transformation from dry-gel to crystal was investigated by means of TG, DSC, XRD. The influence of calcination temperature and the Sr content on the particle-diameters was studied by HREM. The experimental results show that the best sintered temperature is near 800 ℃. The particle diameters decrease with the increase of Sr content.

关 键 词：无机陶瓷材料 纳米材料 溶胶-凝胶法 铬酸锶镧 稀土 

分 类 号：TB326[一般工业技术—材料科学与工程]