CaO-Bi2O3-MoO3-xNb2O5复合掺杂对高磁导率Mn-Zn铁氧体的微观结构和电磁性能的影响

Effects of CaO-Bi2O3-MoO3-xNb2O5 on Electrical and Magnetic Properties of High Permeability Mn-Zn Ferrites

摘要:

采用高温固相反应制备了CaO-Bi₂O₃-MoO₃-xNb₂O₅(x= 0.000-0.075wt%,步长：0.015)复合掺杂的高磁导率Mn-Zn铁氧体材料,利用XRD、SEM、四探针电阻测试仪、阻抗分析仪、和软磁测试仪等分析测试手段对材料结构和性能进行表征,研究了复合掺杂剂对高磁导率Mn-Zn铁氧体材料的结构和电磁性能的影响。结果表明：当Nb₂O₅少量掺杂时,Nb₂O₅可以改善材料的微观结构,提高其密度、频率稳定性和品质因数,提高其电阻率,降低其体积功耗；当Nb₂O₅过量掺杂时,Nb₂O₅将恶化材料的微观结构,导致材料的电磁性能变差。当Nb₂O₅掺杂量为0.030wt%时材料的综合电磁性能最佳。

Abstract:

The high permeability Mn-Zn ferrites doped CaO-Bi₂O₃-MoO₃-xNb₂O₅(x= 0.000- 0.075wt%,step：0.015) were prepared by high temperature solid state reactions. The phase composition, microstructure and electrical and magnetic properties were measured by XRD, SEM, FPP, impedance analyzer and soft magnetic AC testing system. The effects of Nb₂O₅on the Microstructure and magnetic properties of Mn-Zn ferrites were investigated. The results showed that Nb₂O₅ can refine the microstructure, improve the density, frequency stability and quality factor, electrical resistivity and reduce specific losses when a small amount of doping Nb₂O₅ are added. Nb₂O₅ would result in the deterioration of microstructure and the electromagnetic properties of the Mn-Zn ferrites when a large amount of doping Nb₂O₅ is added. When the Nb₂O₅ doping amount is 0.030wt%, the best comprehensive performance of Mn-Zn ferrites were obtained.