高能振动球磨法制备纳米钙钛矿粉体La_(0.8)Ca_(0.2)MnO_3

Preparation of Nanometer Perovskite Powders La_(0.8)Ca_(0.2)MnO_3 by High Energy Vibratory Ball Milling

利用高能振动球磨法,以氧化镧、氧化钙和二氧化锰为原料,制备出纳米氧化物粉体La0.8Ca0.2MnO3。采用XRD分析了球磨过程中粉体的晶化过程;以TEM观察了制备出的粉体的颗粒尺寸和分散状况。结果表明,采用高能振动球磨法20 h就能制备出颗粒尺寸在50~100 nm,属正交晶系的纳米钙钛矿粉体La0.8Ca0.2MnO3;在该反应体系的球磨过程中,产物晶粒经历了先长大后细化的过程。将球磨法制备出的粉体压成电极,进行放电分析。结果表明采用该方法制备出的纳米La0.8Ca0.2MnO3粉体具有很好的电催化活性。

Nanometer oxide powders La0.8Ca0.2MnO3 were synthesized by high-energy vibratory ball milling with mixing La2O3,MnO2 and CaO.The crystallization processes of powders were investigated by XRD;the size of particles and the dispersion of powders were observed by TEM.The results showed that the La0.8Ca0.2MnO3 powders could be synthesized by high-energy vibratory ball milling 20 h.The samples were orthorhombic perovskite structure and the grain sizes were 50~100 nm.The particle showed a first growing and subsequent diminution trend with extending milling time.The powders by ball milling were made into electrode and were discharged.The experimental results indicated that the La0.8Ca0.2MnO3 powders with high-energy vibratory ball milling had good electric catalytic activity.