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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

Ni0.8Zn0.2)O石盐相对(Ni0.4Zn0.6)Fe2O4尖晶石铁氧体电磁性能的影响

王科; 凌志远   

  1. 华南理工大学电子材料科学与工程系 广州 510640
  • 收稿日期:2000-11-01 修回日期:2001-03-12 出版日期:2001-11-20 网络出版日期:2001-11-20

Characteristics of (Ni0.4Zn0.6)Fe2O4 Spinel Ferrites Doped with (Ni0.8Zn0.2)O Halite Additive

WANG Ke; LING Zhi-Yuan   

  1. Department of Electronic Materials Science and Engineering; South China University of Technology; Guangzhou 510640; China
  • Received:2000-11-01 Revised:2001-03-12 Published:2001-11-20 Online:2001-11-20

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摘要： 测量并比较了掺有不同量（Ni0.8Zn0.2)O石盐相添加物（Ni0.4Zn0.6)Fe2O4尖晶石铁氧体的电磁特性．发现（１-ｘ）（Ｎｉ0.4Ｚｎ0.6）Ｆｅ2O4+x(Ni0.8Zn0.2)O铁氧体磁导率频谱在x＝0.05时出现可以用Ｊｏｈｎｓｏｎ和Ｖｉｓｓｅｒ磁路模型合理解释的异常突变．将这一现象结合Ｘ射线衍射、体积密度、直流电阻率、磁导率温谱的实验数据进行分析，我们得出以下结论：当x≤0.05时，铁氧体为单一尖晶石相，尖晶石晶格中少量氧缺位的存在促进了晶粒的生长，提高了瓷体的致密度；当x＞0.05时，铁氧体为尖晶石和石盐石两相混合物，在晶界处非磁性石盐相y＜０.８(NiyZn1-y)O的存在阻碍了尖晶石晶粒的生长，降低了瓷体的致密化程度.

关键词: 石盐相, 尖晶石相, 铁氧体, 微观结构, 电磁性能

Abstract: The characteristics of (Ni0.4Zn0.6)Fe2O4 spinel ferrites doped with various amount of (Ni0.8Zn0.2)O halite additives were investigated.
The permeability frequency spectra of the doped ferrites (1-x)(Ni0.4Zn0.6)Fe2O4+x(Ni0.8Zn0.2)O exhibit an anomalous transition at x=0.05, which can
be well described by the magnetic circuit model developed by Johnson and Visser. From the experimental data of X-ray diffraction, bulk density, dc electrical
resistivity, and permeability temperature spectra, the crystallographic structure of the doped ferrite for x≤0.05 is a pure spinel phase,
the presence of a small amount of oxygen vacancies in spinel lattice favors the grain growth and promotes the densification. For x>0.05, the crystallographic
structure is a diphasic mixture. The segregation of nonmagnetic y<0.8 (NiyZn1-y)O halite second phase on grain boundary hinders the spinel grain growth and lowers the densification.

Key words: halite, spinel, ferrite, microstructure, electrical and magnetic properties

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