预烧温度对LiZn铁氧体微结构和性能的影响  

Effects of Calcining Temperature on Microstructure and Properties of Lithium-zinc Ferrites

作　　者：刘承勇[1] 兰中文[1] 蒋晓娜[1] 余忠[1] 孙科[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《压电与声光》2008年第5期604-607,共4页Piezoelectrics & Acoustooptics

基　　金：国防预研基金资助项目(513070603;514070202)

摘　　要：研究了预烧温度对LiZn铁氧体微结构、密度、气孔率和磁性能的影响。结果表明,预烧温度影响粉体的活性,适宜的预烧温度是获得良好显微结构和高性能铁氧体的必要保证。气孔率P减小,饱和磁感应强度Bs、矩形比Br/Bs(Br为剩余磁化强度)增加;平均晶粒尺寸Dm增大,矫顽力Hc减小。P和Dm决定铁磁共振线宽ΔH的大小,但前者的作用比后者大。当预烧温度为800℃时,材料的P最小,Bs和Br/Bs达到最大值,ΔH有最小值。当预烧温度为950℃时,Dm最大,Hc最小。综合各方面的性能,最佳的预烧温度确定为800℃。The effects of calcining temperature on the microstructure, density, porosity and magnetic properties of lithium-zinc ferrite were investigated. The results show that a proper calcining temperature is essential in order to obtain the ferrite with fine microstructure and magnetic properties because the calcining temperature influences the activtity of particles. The saturation magnetic induction and squareness ratio increase when the porosity declines. With the average grain size increasing, the coercive force declines. Ferromagnetic resonance line-width depends on both porosity and average grain size to some extent, but the former has stronger effect on the ferromagnetic reso nance line-width than the later. The saturation magnetic induction and squareness ratio reach a peak, and ferromag netic resonance line-width is minimum when the calcining temperature is up to 800 ℃, which could be attributed to the lowest porosity. The coercive force is minimum with the calcining temperature of 950 ℃, which could be attributed to the biggest average grain size. Considering all properties, the optimal calcining temperature is 800 ℃.

关 键 词：预烧温度 微结构 密度 气孔率 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]