Influence of MoO3 and V2O5 co-doping on the magnetic properties and microstructure of a Ni–Zn ferrite

Effect of MoO3 and V2O5 additions on the grain growth and magnetic properties of a Ni–Zn ferrite was studied. The ferrites were produced by conventional powder method. The samples doped with 0.05 wt% of MoO3 in addition to 0.2 wt% of V2O5 (V2O5-riched sample). For comparison, the MoO3-riched sample which contains 0.05 wt% of V2O5 in addition to 0.2 wt% of MoO3 and a sample without V2O5 and MoO3 were prepared by similar process. The results showed that MoO3 and V2O5 dopants into Ni–Zn ferrites improved magnetic properties (such as magnetic permeability and saturation magnetization) and power loss characteristics of the materials at frequencies above 1 MHz. MoO3 and V2O5 co-doping increased grain size (to about 20 μm) and sintered density (to about 4.8 g/cm3) and also decreased power loss noticeably at sintering temperatures between 900 and 1200 °C.