Co^(2+)替代对NiCuZn铁氧体电磁性能的影响

Effect of Co^(2+) Substitution on the Electromagnetic Properties of Low-temperature-fired NiCuZn Ferrites

采用固相反应法制备了低温烧结NiCuZn铁氧体,研究了Co2+替代量对铁氧体材料显微结构、饱和磁感应强度、矫顽力以及在偏置磁场下磁导率和品质因数的影响。研究表明,对于低磁导率的NiCuZn铁氧体,适量Co2+替代可对铁氧体负的磁晶各向异性常数进行补偿,能在一定程度上提升材料的磁导率。在大直流偏置场的作用下,铁氧体的磁导率都出现明显的下降,而矫顽力是决定其增量磁导率的主要因素。

In this paper, low-temperature-fired NiCuZn ferrites were prepared by solid-state reaction method. The effects of Co^2＋ substitution on microstructure, saturation magnetic flux density, coercivity and permeability, Q-factor under DC-bias-superposition field were investigated. It was found that proper content of Co^2＋ substitution could compensate the negative magnetocrystalline anisotropy constant of the ferrite and resultantly lead to the increase of permeability. Permeability continuously decreases with increasing DC-bias-superposition field. And the incremental permeability of the material under high DC-bias-superposition field is mainly dependent on its eoereivivity.