Mg_(0.6)Cu_(0.1)Zn_(0.3)Fe_(2+x)O_(4+3/2x)铁氧体的结构和磁性能

分别采用过铁、正铁和缺铁配方通过固相反应法制备MgCuZn铁氧体,分析了Fe3+对铁氧体的磁性能和烧结特性的影响。微量缺铁有助于促进烧结并改善磁性能,过铁情况下,饱和磁化强度随x值增大迅速下降,在x=0.06处下降至38.84 A·m2/kg,相应的磁导率下降,截止频率向高频移动。并研究了微量V2O5掺杂对改善磁性能的作用,在掺杂量为0.4wt%处获得虚部损耗的有效提升(截止频率处提升近30%)。在此基础上探讨了MgCuZn铁氧体用作抗EMI磁珠的可行性,其低廉的价格相较于传统的Ni Zn/Ni Cu Zn铁氧体具有明显的优势。

Microstructure and magnetic properties of Mg0.6Cu0.1Zn0.3Fe2+xO4+3/2x ferrites

MgCuZn ferrites were prepared by solid-state reaction method with different iron content, and the influence of Fe3+on permeability and sintering properties was discussed. It is found that iron-deficiency can promote the sintering and improve permeability. In the case of iron-rich, the saturation magnetization drops rapidly with increasing iron-rich content x values (at x=0.06 it drops to 38.84 A·m2/kg), and accordingly the permeability decreases and the cut-off frequency shift to a higher frequency. Improvement of V2O5 dopant to magnetic properties was studied. For V2O5 dopant of 0.4 wt%the imaginary part of permeability is enhanced effectively and cut-off frequency increases by about 30%). And the feasibility of MgCuZn ferrite beads for EMI application was discussed, and it shows that compared with the traditional NiZn/NiCuZn ferrite has obvious advantages for its low price.