固相法合成Li铁氧体纳米粒子  

Synthesis of Nanoparticles of Li Ferrite by Solid State Method

作　　者：姜继森[1] 高濂[1] 郭景坤[1] 杨燮龙[2] 沈鸿烈[3] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室,上海200050 [2]华东师范大学物理系,上海200062 [3]中国科学院上海冶金研究所信息功能材料国家重点实验室,上海200050

出　　处：《无机材料学报》1999年第3期385-390,共6页Journal of Inorganic Materials

摘　　要：以Li2CO3和α-Fe2O3粉体为原料，通过高能球磨的机械化学处理，制备出具有固溶体结构的Li铁氧体的前驱体．将前驱体在远低于固相反应所需的温度下进行热处理，得到Li铁氧体粉体，这一反应是通过LiFeO2作为中间相完成的．用Mossbauer谱、XRD、IR光谱、TEM及VSM方法对制得的Li铁氧体粉体进行了表征．结果表明，所得铁氧体为纳米粒子，具有有序结构，其比饱和磁化强度高于用湿化学方法所得的纳米粒子，且具有较高的矫顽力．The precursor of Li ferrite with a solid solution structure was prepared by mechanochemical treatment of Li2CO3 and α-FeO3 powders through high energy ball milling. Li ferrite was obtainedafter heat treatment of the precursor under a temperature much lower than that required in generalsolid state reaction. LiFeO2 was the intermediate of the formation of Li ferrite. The ferrite was characterized by Mossbauer spectra, XRD, IR spectra, TEM and VSM methods. The results showed that the ferrite was nanoparticles with ordered structure of Li+ and Fe3+ ions in the octahedral sites of the ferrite. The magnetization of the ferrite nanoparticles was higher than that of the samples synthesized by wet chemical method and the coercivity of the ferrite was higher than that of the bulk ferrite.

关 键 词：铁氧体 纳米粒子 高能球磨 锂 固相法 合成 

分 类 号：TM277.051[一般工业技术—材料科学与工程] TF123.72[电气工程—电工理论与新技术]