钡铁氧体超微磁粉颗粒的表面磁特性  

THE SURFACE MAGNETIC CHARACTERISTICS OF BARIUM FERRITE ULTRAFINE PARTICLES

作　　者：司新文[1,2] 刘建中[1,2] 杨正[1,2] 耿胜利[1,2] 

机构地区：[1]中国科学院化工冶金研究所 [2]兰州大学磁性材料研究所

出　　处：《化工冶金》1997年第3期197-201,共5页

基　　金：国家自然科学基金

摘　　要：用玻璃晶化法经改善制备工艺得到了ＣｏＳｎ、ＣｏＴｉ置换型钡铁氧体超微磁粉，通过分析饱和磁化强度与比表面积间的关系，得出了它们之间的经验公式，并估算出颗粒表面非磁性层厚度在１ｎｍ左右．A new method for manufacturing barium ferrite (BaF) ultrafine particles,the stepwise cumulative crystallization heat treatment process, isdeveloped. The average particle size of BaF ultrafine particlesobtained is 50 nm. In terms of the interrelation between specific magnetizationand specific surface area of BaF fine particles, the surface spincanting effect of the barium ferrite ultrafine particles is probed. Theresults show that the dead magnetic layer thickness of BaF ultrafineparticles (substituted by CoTi or CoSn) is 1 nm by the order of magnitudeand experimental correlations between σ 16 and S a of barium ferrite particles are also obtained.

关 键 词：钡铁氧体 玻璃晶化法 超微磁粉 表面磁特性 

分 类 号：TF125.8[冶金工程—粉末冶金] TM277[冶金工程—冶金物理化学]