BZB和Bi2O3添加对NiCuZn铁氧体微观结构及直流偏置特性的影响  

Effects of BZB and Bi2O3 doping on the microstructure and DC bias characteristics of NiCuZn ferrites

作　　者：沈琦杭 贾利军[1] 邱华 解飞[1] 郑宇航 SHEN Qi-hang;JIA Li-jun;QIU Hua;XIE Fei;ZHENG Yu-hang(State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China)

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

出　　处：《磁性材料及器件》2020年第1期10-13,35,共5页Journal of Magnetic Materials and Devices

摘　　要：在(NiO)0.39(CuO)0.21(ZnO)0.39(Co2O3)0.005(Fe2O3)0.95的铁氧体预烧粉体中掺杂固定含量的Bi2O3-ZnO-B2O3(BZB)玻璃和不同含量的Bi2O3,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)等对材料物相组成和微观结构进行了分析,并在此基础上探讨了材料微观结构、矫顽力Hc对材料直流偏置性能的影响。研究发现,适量掺杂时,样品不仅得到最高矫顽力Hc,而且微观形貌呈现出较多特殊多重显微结构。这种特殊显微结构有利于形成较强的退磁场,使样品在较强外加直流偏置场时磁感应强度不易趋于饱和,进而提高样品抗直流偏置能力和饱和磁感应强度。其中,当BZB与Bi2O3的掺杂量为0.45 wt%和0.06 wt%时,样品H70%达到最大626 A/m。BZB glass with fixed content and Bi2O3 with different content were doped in(NiO)0.39(CuO)0.21(ZnO)0.39(Co2O3)0.005(Fe2O3)0.95 ferrite pre-sintered powder.The phase composition and micro-structures of the samples were studied by X-ray diffraction(XRD)and scanning electron microscopy(SEM),respectively.On this basis,the effects of material micro-structure and coercivity Hc on DC bias performance of the material are discussed.It was found that for proper doping,the samples not only have the highest coercivity Hc,but also exhibit more special and multiple micro-structures.This special micro-structure is beneficial to the formation of strong demagnetization field,which makes the magnetic induction intensity of the sample not easy to be saturably magnetized when applied with a strong DC bias field.It is beneficial to improve the DC superposition and saturation magnetic induction strength of the sample.The results show that when the doping amount of BZB and Bi2O3 is 0.45 wt%and 0.06 wt%,the maximum H70%of the sample reaches 626 A/m.

关 键 词：NICUZN铁氧体 复合掺杂 微观结构 磁导率 直流偏置 

分 类 号：TM277.1[一般工业技术—材料科学与工程]