硅酸盐学报2011，Vol.39Issue(12)：1892-1897,6.
La0.7Ca0.3MnO3纳米颗粒的聚丙烯酰胺凝胶法制备及性能
Polyacrylamide Gel Preparation and Properties of La0.7Ca0.3MnO3 Nanoparticles
摘要
Abstract
A polyacrylamide gel route was used to fabricate La0.7Ca0.3MnO3 nanoparticles. Influence of pH values and chelating agents on particle morphology and properties of the prepared La0.7Ca0.3MnO3 nanoparticles were investigated by X-ray diffraction and scanning electron microscopy. The optimal pH value for synthesis of perovskite La0.7Ca0.3MnO3 was obtained to be 2. Using acetic acid, oxalic acid, citric acid, and ethylenediamine-tetraacetic acid as chelating agents, single-phase La0.7Ca0.3MnO3 nanoparticles were prepared at a calcination temperature of 600 ℃. The particles prepared using the four chelating agents are uniform and regu- larly-shaped spheres, and have an average size of 30, 37, 45 nm, and 50 nm, respectively. When using tartaric acid as the chelating agent, a much higher calcination temperature at 900 ℃ was required to produce single-phase La0.7Ca0.3MnO3 particles. The obtained particles exhibit an irregular morphology and an obvious adhesive behavior, and have a relatively large average size of 170 nm. Mag- netic hysteresis loop measurements indicate that the prepared La0.7Ca0.3MnO3 samples exhibit paramagnetism at room temperature, but their paramagnetic susceptibilities exhibit a decreasing trend with the decrease of sample particle size.关键词
钙钛矿锰氧化物/纳米颗粒/聚丙烯酰胺凝胶法/pH值/络合剂Key words
perovskite manganites/nanoparticles/polyacrylamide gel method/pH value/chelating agents分类
数理科学引用本文复制引用
朱彦虎,杨华,县涛,魏智强,马金元,冯旺军..La0.7Ca0.3MnO3纳米颗粒的聚丙烯酰胺凝胶法制备及性能[J].硅酸盐学报,2011,39(12):1892-1897,6.基金项目
国家自然科学基金(50962009),教育部重点(209130),甘肃省自然科学基金(1010RJZA041)及兰州理工大学优秀青年资助计划(Q200902)资助项目. （50962009）
