预烧工艺对镍锌铁氧体微观结构和磁性能的影响  

Effect of pre-sintering process on the microstructure and magnetic properties of NiZn ferrite

作　　者：程利霞[1] 刘焕威 苏童霓 俞彬 陈振陆 夏明邦 李雅洁 龚伟平[1] 刘敏[1] CHENG Li-xia;LIU Huan-wei;SU Tong-ni;YU Bin;CHEN Zhen-lu;XIA Ming-bang;LI Ya-jie;GONG Wei-ping;LIU Min(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4期65-69,共5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项目(2017A030310665);惠州学院自然科学基金项目(2015167;hzuxl201626)。

摘　　要：采用固相反应法制备镍锌铁氧体,主要研究了预烧过程中预烧温度和预烧保温时间对材料的微观结构和磁性能的影响。XRD显示,在预烧过程中,在不同的预烧温度(830℃、850℃和880℃)和预烧保温时间(2 h,3 h,4 h,5h和6 h)下均能形成尖晶石相,随着预烧温度的升高,尖晶石相的主峰强度略有增强,而预烧保温时间对主晶相影响不大;SEM观察显示,随着预烧温度的升高,晶粒尺寸变大,随着预烧保温时间的延长,晶粒尺寸变小,气孔率降低;磁性能测试结果显示,在850℃进行预烧且预烧保温时间为3 h时,Ni0.6Zn0.4Fe2O4磁性能最优,σs为99.9 emu/g,4pMs为6537G,Hc为6.5 Oe。然而,异常高的σs、4pMs及较高Hc数值表明该材料为非单相的NiZn铁氧体。Ni0.6Zn0.4Fe2O4 ferrite was prepared by solid reaction method. The effects of pre-sintering temperature and pre-holding time on the microstructure and magnetic properties of NiZn ferrite were investigated. The spinel phase was detected in the samples treated at different pre-sintering temperature(830 ℃、850 ℃ and 880 ℃) and pre-holding time(2 h,3 h,4 h,5 h and 6 h), as shown in XRD. In addition, the strength of the main peak increases slightly with the increase of pre-sintering temperature, while little effect on the main crystal phase was found with the prolonging of pre-holding time. The grain size and porosity of NiZn ferrite are affected obviously by pre-sintering proce σs. As can be seen from SEM, the grain size increases with the increase of pre-sintering temperature. The grain size and porosity decrease with the prolonging of holding time in the pre-sintering stage. From VSM it shows that the magnetic properties of Ni0.6Zn0.4Fe2O4 are the best for pre-sintering at 850 ℃ for 3 h with specific saturation magnetization of 99.9 emu/g and the coercivity of 6.5 Oe, these high σs, 4pMs and Hc values reveal that the material is a non-single-phase NiZn ferrite.

关 键 词：镍锌铁氧体 固相反应 预烧工艺 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]