摘要
用化学共沉淀工艺制备了Co-Ti替代系列钡铁氧体磁粉及烧结磁体,结合相结构、显微形貌分析和对材料磁化机理的讨论,该文主要研究了替代量和烧结温度对钡铁氧体高频磁性的影响。实验表明,初始磁导率和共振频率随替代量的变化存在极值,当Co-Ti替代量为1.0时钡铁氧体具有较高的磁导率和较低的磁共振频率,偏离1.0均导致磁导率的降低和磁共振频率的升高;高烧结温度导致晶粒尺寸的长大和晶格结构的完善,有利于提高材料的磁导率,同时降低了磁共振频率。
CoTi substituted barium ferrites were prepared by chemical coprecipitation and sintering in air.Effects of CoTi substitution amount and sintering temperature on highfrequency magnetic properties were studied with XRD,SEM,TEM and the measurements of complex permeability dispersions.It is indicated that barium ferrite with CoTi substitution x=1.0 has the lowerst magnetic resonant frequency and the highest initial permeability,any deviation from 1.0 will results in higher resonant frequency and lower initial permeability.Higher sintering temperature corresponding to higher initial permeability by enlarging magnetic particles and perfecting the crystallines,but with lower resonant frequency.
出处
《压电与声光》
CSCD
北大核心
2003年第2期139-141,151,共4页
Piezoelectrics & Acoustooptics
基金
国家高技术发展计划("八六三"计划)基金资助项目(2001AA320502)
关键词
钡铁氧体
化学共沉淀法
高频磁性
barium ferrite
chemical coprecipitation
high-frequency magnetic properties
