(1-x)(Ni_(0.4)Zn_(0.6))Fe_2O_4+x(Ni_(0.8)Zn_(0.2))O铁氧体的微观结构与电磁特性  

Microstructure and Electromagnetic Properties of (1-x)(Ni_(0.4)Zn_(0.6))Fe_2O_4+x(Ni_(0.8)Zn_(0.2))O Composite Ferrites

作　　者：凌志远[1] 王科[1] 张庆秋[1] 

机构地区：[1]华南理工大学电子材料科学与工程系,广东广州510640

出　　处：《磁性材料及器件》2001年第5期5-9,共5页Journal of Magnetic Materials and Devices

摘　　要：对 ( 1 - x) ( Ni0 .4 Zn0 .6) Fe2 O4 + x( Ni0 .8Zn0 .2 ) O铁氧体的 X射线衍射、体积密度、直流体电阻率、磁导率温度谱和频率谱等测试数据进行比较分析发现 :当 x≤ 0 .0 5时 ,铁氧体为单纯的尖晶石相 ,尖晶石晶格中少量氧缺位存在有利于促进晶粒的生长 ,提高铁氧体初始磁导率和致密度 ;当 x>0 .0 5时 ,铁氧体为尖晶石和石盐石两相复合体 ,非磁性石盐石相 ( Niy Zn1- y)O( y<0 .8)在晶界处的存在极大地减缓了晶粒的生长速度 ,促进了晶粒细化 。From the experimental data of X ray diffraction,bulk density,DC electrical resistivity,temperature and frequency dependence of permeability, the microstructure and electromagnetic properties of (1- x )(Ni 0 4 Zn 0 6 )Fe 2O 4+ x (Ni 0 8 Zn 0 2 )O ferrites were investigated in this study. It is found that for x ≤0.05,the crystallographic structure of the doped ferrite is a pure spinel phase. The presence of a small amount of oxygen vacancies in spinel lattice favors the grain growth and increase of initial permeability, and promotes the densification. For x > 0.05 , the crystallographic structure is a diphasic mixture of halite and spinel. The segregation of second phase of nonmagnetic (Ni y Zn 1- y )O( y <0.8)halite on grain boundary hinders the spinel grain growth and results in a small grain microstructural texture,which modifies the electromagnetic properties at high frequency and thermal stability.

关 键 词：石盐石相 尖晶石相 微观结构 电磁特性 (1-x)(Ni0.4Zn0.6)Fe2O4+x(Ni0.8Zn0.2)O铁氧体 温度稳定性 

分 类 号：TM277[一般工业技术—材料科学与工程]