复合添加剂对NiCoCuZn铁氧体高频磁导率色散行为的影响

Effect of Composite Additives on Magnetic Permeability Dispersion Behaviors of NiCoCuZn Ferrites

用低温烧结法制备NiCoCuZn尖晶石铁氧体,并研究了不同复合添加剂(Bi2O3-V2O5,Bi2O3-PbO)对其磁导率色散行为的影响。结果表明:在Bi2O3-V2O5复合掺杂时,晶粒尺寸随Bi2O3含量的增大而增大。微观结构的变化导致了材料初始磁导率和截止频率的变化。磁导率的色散机制主要以畴壁位移为主。然而在Bi2O3-PbO复合掺杂下,晶粒尺寸随Bi2O3含量的减小而增大,材料的初始磁导率较Bi2O3-V2O5复合掺杂更小,截止频率更高。

NiCoCuZn spinel ferrites were prepared by a low-temperature sintering procedure with adding different composite additives, Bi2O3-V2O5 and Bi2O3-PbO. The effect of different composite additives on their magnetic permeability dispersion behaviors was investigated. Results show that for the samples with Bi2O3-V2O5 additive, the grain size increases with increasing of the Bi2O3 content in the composite additive. The microstructure change results in variations of initial magnetic permeability values and cutoff frequencies. Their permeability dispersion behaviors are ascribed to the domain wall movement mechanism. However, for the samples with Bi2O3-PbO additive, the grain size decreases with increasing of the Bi2O3 content in the composite additive. Compared with samples with Bi2o3-V2O5 additive, their initial magnetic permeability values are smaller, but the cutoff frequencies are higher.