【作者】 贾利军； 陆小勇； 张怀武； 刘颖力； 钟智勇；

【Author】 JIA Li-jun LU Xiao-yong ZHAGN Huai-wu LIU Ying-li ZHONG Zhi-yong (Key Laboratory of Electronic Thin Films and Intergrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China)

【机构】 电子科技大学电子薄膜与集成器件国家重点实验室；

【摘要】 以 LiOH·H₂O,Fe₂O₃和草酸为原料,通过流变相反应,制得草酸盐结构的 Li 铁氧体前驱体．将前驱体在远低于通常的固相反应的温度下进行热处理,得到 Li 铁氧体纳米粒子．这一反应通过 LiFeO₂作为中间相来完成．用 XRD 和 VSM 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,且具有较高的饱和磁化强度和矫顽力．纳米晶 Li 铁氧体粉料表现出良好的微波吸收特性．更多还原

【Abstract】 The precursor of Li ferrite with an oxalate composition was prepared via a rheological phase reaction of LiOH·H₂O, Fe₂O₃ and oxalic acid.Nanocrystalline Li ferrite powders were obtained after heat treatment of the precursor under a temperature much lower than required in conventional solid state reaction.LiFeO₂ was the intermediate of the formation of Li ferrite.The ferrites were characterized by an XRD and VSM method.The results showed that the ferrites were nanocrystalline particles with ordered structure of Li⁺ and Fe³⁺ions in the octahedral sited of the ferrite.The magnetization of the ferrite nanoparticles was higher than that of the samples synthesized by sol-gel method and the corcivity of the ferrite was higher than that of the bulk ferrite.The well absorbing performance in the microwave range was obtained for the nanoerystalline Li-ferrite powders.更多还原