预压压强对镍锌铁氧体微观结构和磁性能的影响  

Effect of preloading pressure on the microstructure and magnetic properties of NiZn ferrite

作　　者：刘敏[1] 陈奕初 张柯 林芷盈 陈湘鹏 胡国莲 龚伟平[1] 李雅洁 程利霞[1] LIU Min;CHEN Yi-chu;ZHANG Ke;LIN Zhi-ying;CHEN Xiang-peng;HU Guo-lian;GONG Wei-ping;LI Ya-jie;CHENG Li-xia(Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices,Huizhou University,Huizhou 516007,China)

机构地区：[1]惠州学院广东省电子功能材料与器件重点实验室,广东惠州516007

出　　处：《磁性材料及器件》2021年第3期68-71,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(51602376,51602121);广东省自然科学基金资助(2017A030310665);惠州学院自然科学基金项目(2015167,hzuxl201626)。

摘　　要：采用固相烧结法制备了镍锌铁氧体,研究了在固定预烧温度850℃和烧结温度1200℃下预压压强对镍锌铁氧体微观结构和磁性能的影响。X射线衍射显示,预压强度不同的烧结样品均有尖晶石相出现,但主峰强度强弱不同,未经预压的铁氧体主峰强度最强;扫描电镜照片显示,未经预压的铁氧体晶粒尺寸分布较均匀,晶界交汇处几乎没有气孔,随着预压压强的增大,晶界交汇处的气孔增多;且未经预压的铁氧体,其比饱和磁化强度最高90.9emu/g,4πM_(s)最高5883 G,矫顽力6.2 Oe,然而这些过高数值揭示该材料不是单相NiZn铁氧体。NiZn ferrite was prepared by the method of solid-phase sintering.The effects of preloading pressure on microstructure and magnetic properties of Ni Zn ferrite prepared by fixed pre-firing temperature 850℃and sintering temperature 1200℃were studied.The X-ray diffraction spectra for sintered samples displays that samples with different preloading pressure have a spinel phase,but the strength of the main peak is different,the ferrite without preloading pressure owns the strongest peak.Scanning electron microscope images show that the distribution of grain size of ferrite is more uniform without preloading pressure,and there are almost no pores at the intersection of grain boundaries with increasing preloading pressure,the number of pores increases at the intersection of grain boundaries.And ferrite without preloading pressure has the specific saturation magnetic strength of 90.91 emu/g,saturation magnetization 4πMs of 5883 G and coercivity of 6.2 Oe,while these high values reveal that the material is a non-single-phase NiZn ferrite.

关 键 词：镍锌铁氧体 固相烧结法 预压压强 微观结构 磁性能 

分 类 号：TM277.1[一般工业技术—材料科学与工程]