Bi掺杂对Ni-Zn-Cu铁氧体的烧结与磁性能的影响

Effects of Bi Doping on the Sintering and Magnetic Properties of Ni Zn Cu Ferriets

低温烧结软磁铁氧体是表面组装元件（ＳＭＤ）中的一类关键材料。本文对Ｂｉ掺杂的低温烧结Ｎｉ－Ｚｎ－Ｃｕ铁氧体从烧结性质、结构与相组成、显微形貌、磁结构和磁性质（磁导率、品质因数及频谱）方面进行了研究，在此基础上分析了Ｂｉ掺杂对材料形成过程和磁化机制的影响，发现Ｂｉ对材料磁性能的改进所起的作用主要产生于它对材料显微结构（晶粒、晶界和气孔）的调制。

Soft magnetic ferrites with low sintering temperature are a kind of key materials for surface mounting devices (SMD).In this paper,Bi doped low temperature sintered Ni Zn Cu ferrite was studied in the aspects of sintering properties,structure and phase composition, microstructure,magnetic structure and magnetic properties (permeability, Q value and frequency spectrum).The effects of Bi doping on the formation process and magnetization mechanism were analyzed.It is found that the improvement of the magnetic properties of the host materials by Bi doping can be attributed to microstructure modification.