掺杂对高磁导率锰锌铁氧体性能的影响

发布时间：2018-02-02 08:16

  本文关键词： 锰锌铁氧体 初始磁导率 掺杂 化学共沉淀　出处：《昆明理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文研究了化学共沉淀法制备锰锌铁氧体的基本工艺,并对高磁导率锰锌铁氧体进行了化学掺杂,研究了掺杂元素(Ca. Bi和Ti)对高磁导率锰锌铁氧体性能的影响。 为了改善铁氧体材料的频率特性,对锰锌铁氧体MnxZn1-xFe2O4进行Ca元素掺杂,并制备了环状样品,测量环状样品的初始磁导率随频率的变化(即μi-f曲线)。研究发现,随着Ca含量的增多,频率特性得到改善,在250Hz内,初始磁导率仍然可以保持在10000左右。在Ca含量为0.02mol时各项性能最优,材料具有较好的磁性能及微观结构。另一方面,随着Ca掺杂量的增加,初始磁导率减小速度增大,这与Ca2+的掺杂位置有关。 本实验还研究了Bi203掺杂对Mno.4Zn0.6Fe2O4铁氧体材料的结构与磁性能(包括磁化强度、初始磁导率以及晶粒尺寸)的影响。结果显示,当Bi203掺杂后,在700℃开始,形成液相烧结,使材料的晶粒尺寸显著增加,致密度增大；在掺杂量为0.005mol时,初始磁导率有最优值,晶粒尺寸增大较明显,较均匀。说明Bi203掺杂不但可以改善铁氧体的磁性能也能优化其微观结构。实验发现,随着Bi203元素的增加,材料的晶粒尺寸不断变大,出现异常长大,及不均匀性,这表明,Bi203具有促进晶粒生长的作用。 此外,还对Ti02进行了掺杂,进行了Bi2O3-CaO-SiO2的复合掺杂实验研究,通过反复试验,初步确定了其掺杂对高磁导率锰锌铁氧体的性能的影响,并且,进行了SEM、平均粒度、初始磁导率、XRD及XPS分析,XRD及XPS证实为锰锌铁氧体结构,及掺杂的位置,其他测试则证明了其掺杂对性能的影响。取得良好的实验结果,并为工业应用提供了依据。
[Abstract]:In this paper, the basic technology of preparing Mn-Zn ferrite by chemical coprecipitation was studied, and the high permeability Mn-Zn ferrite was chemically doped. The effect of doping elements such as Ca. Bi and Ti on the properties of manganese-zinc ferrite with high permeability was studied. In order to improve the frequency characteristics of ferrite materials, MnxZn1-xFe2O4 was doped with Ca and the annular samples were prepared. The change of initial permeability with frequency (渭 i-f curve) was measured. It was found that with the increase of Ca content, the frequency characteristics were improved within 250 Hz. The initial permeability can still be kept at about 10000. When Ca content is 0.02mol, the properties of the material are the best, and the material has better magnetic properties and microstructure, on the other hand. The decrease rate of initial permeability increases with the increase of Ca doping content, which is related to the doping position of Ca2. The structure and magnetic properties (including magnetization) of Bi203 doped Mno.4Zn0.6Fe2O4 ferrite materials were also investigated. The effect of initial permeability and grain size). The results show that when Bi203 is doped, liquid phase sintering is formed at 700 鈩，

本文编号：1484056