无机材料学报

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固相法合成Li铁氧体纳米粒子

姜继森; 高濂; 郭景坤; 杨燮龙+; 沈鸿烈++   

  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; +华东师范大学物理系; 上海 200062; ++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
  • 收稿日期:1998-07-16 修回日期:1998-08-21 出版日期:1999-06-20 网络出版日期:1999-06-20

Synthesis of Nanoparticles of Li Ferrite by Solid State Method

JIANG Ji-Sen; GAO Lian; GUO Jing-Kun; YANG Xie-Long+; SHEN Hong-Lie++   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Iinstitute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China;- +Department of Physics; East China Normal University Shanghai 200062 China; ++State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-07-16 Revised:1998-08-21 Published:1999-06-20 Online:1999-06-20

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.

关键词: Li铁氧体, 纳米粒子, 高能球磨, 机械化学处理

Abstract: The precursor of Li ferrite with a solid solution structure was prepared by mechanochemical treatment of Li2CO3 and α-Fe2O3
powders through high energy ball milling. Li ferrite was obtained after heat treatment of the precursor under a temperature much lower than that
required in general solid 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.

Key words: Li ferrite, nanoparticle, high energy ball milling, mechanochemical treatment

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