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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (5): 409-414. 上一篇    下一篇

研究论文

低热固相反应制备一维棒状CoFe2O4及其电磁特性

庄 稼* 刘承杰 李焕明

  

  1. (西南石油大学材料科学与工程学院 成都 610500)

  • 投稿日期:2008-05-10 修回日期:2008-07-16 发布日期:2009-03-14
  • 通讯作者: 庄稼

Preparation of One-Dimensional Stick-Like CoFe2O4 by Low-Heating Solid State Reaction and Its Electromagnetic Property

Zhuang, Jia* Liu, Chengjie Li, Huanming   

  1. (School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500)
  • Received:2008-05-10 Revised:2008-07-16 Published:2009-03-14
  • Contact: Zhuang, Jia

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1318

被引次数

16

以草酸、硝酸铁、硝酸钴为原料, 加入不同聚合度的PEG, 采用低热固相反应法制备出草酸铁和草酸钴的混合前驱物. 在不同的温度(25, 60, 70, 75 ℃), 混合前驱物分别恒温反应2 h, 然后经450 ℃灼烧. 对获得的粉体用XRD, SEM, 激光粒度仪表征后证明: 加入PEG400在75 ℃反应获得了长径比约为6～15范围, 具有立方晶系尖晶石结构的棒状CoFe2O4铁氧体粉末. 经测试电磁学性质发现, 与粒状的CoFe2O4相比, 棒状的CoFe2O4磁导率虚部在高频15～20 GHz范围增加了近1倍, 各向异性常数Ku则增加了近5倍. 预示一维棒状结构的CoFe2O4作为吸波材料具有良好应用前景.

关键词: 铁酸钴, 一维棒状, 低热固相反应, 磁导率, 吸波材料

The mixed precursors of oxalic iron and oxalic cobalt were prepared with oxalic acid, nitric iron, nitric cobalt and PEG of different polymerization degrees by a low-heating solid-state reaction, and reacted for 2 h at different temperature (25, 60, 70, 75 ℃). A powder was obtained after calcination at 450 ℃, and characterized by XRD, SEM and laser granularity analysis. The stick-like CoFe2O4 powder was obtained with PEG400 at 75 ℃, with its proportion of length to diameter in a range of 6～15, in a cube lattice spinel structure. The electromagnetic property was studied by the relative dielectric constant and relative magnetic permeability of the ferrite. The magnetic permeability of the stick-like CoFe2O4 is about once and the anisotropy constant is about 5 times larger than those grain-like one in a frequency range of 15～20 GHz. The stick-like CoFe2O4 has fine application foreground by way to materials of absorbing electromagnetic wave in future.

Key words: CoFe2O4, one-dimensional stick-like, low-heating solid-state reaction, magnetic permeability, absorbing material