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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

尖晶石型Ni0.8Zn0.2Fe2O4纳米晶体的?制备及电磁性能研究

孙杰1,2, 刘建华1, 李松梅1   

  1. 1. 北京航空航天大学材料科学与工程学院, 北京 100083; 2. 沈阳理工大学环境与化工学院, 沈阳 110168
  • 收稿日期:2004-07-13 修回日期:2004-09-27 出版日期:2005-09-20 网络出版日期:2005-09-20

Synthesis and Electromagnetic Properties of Ni0.8Zn0.2Fe2O4 Nanocrystalline

SUN Jie1,2, LIU Jian-Hua1, LI Song-Mei1   

  1. 1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. School of Environment and Chemical Engineering, Shenyang Institute of Technology, Shenyang 110168, China
  • Received:2004-07-13 Revised:2004-09-27 Published:2005-09-20 Online:2005-09-20

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摘要： 以金属离子的柠檬酸盐为前驱体, 通过sol-gel自燃烧的合成方法制备了镍锌铁氧体(Ni0.8Zn0.2Fe2O4)纳米晶体. 采用FT-IR、DSC-TG、XRD、TEM波导等方法对产物以及产物的电磁性?能进行了表征. 结果表明, 在前驱体中, 金属离子与柠檬酸以络合物的形式存在. 凝胶在220℃完成自燃烧反应. 随着热处理温度的升高, 粉体的?粒径逐渐增大. 纳米晶体在8～12GHz的测试条件下具有介电损耗与磁损耗. 随着?涂层厚度的增加, 混合媒质的微波反射率逐渐增加, 反射率吸收峰随着厚度的?增加向低频移动.

关键词: 溶胶-凝胶自燃烧法, 纳米晶体, 镍锌铁氧体, 微波吸收性能

Abstract: The nanocrystalline Ni0.8Zn0.2Fe2O4 was synthesized by a sol-gel auto-combustion method using citric acid as the chelating agents. The analysis methods of FT-IR, XRD, DSC-TG,
TEM, wave-guide were used to character the gel and the products. The phenomena of melt, combustion and forming crystal for gel were investigated in the processes of thermo-decomposition.
The results show that metal ions and carboxyl are coordinated by the oriented manner. The temperature of decomposition for the gel is 220℃,
and the nanocrystalline is formed after the combustion of the gel. The mixture, which consists of Ni0.8Zn0.2Fe2O4 nanocrystalline and
paraffin, has both dielectric loss and magnetic loss in the frequency range of 8～12GHz. The reflectivity of spinel nanocrystalline increases and
the reflectivity absorption peaks shift from high frequency to low frequency with the increase of thickness.

Key words: sol-gel auto-combustion, nanocrystalline, Ni0.8Zn0.2Fe2O4, microwave absorption

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