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

Abstract Effect of MoO 3 and V 2 O 5 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 MoO 3 in addition to 0.2 wt% of V 2 O 5 (V 2 O 5 -riched sample). For comparison, the MoO 3 -riched sample which contains 0.05 wt% of V 2 O 5 in addition to 0.2 wt% of MoO 3 and a sample without V 2 O 5 and MoO 3 were prepared by similar process. The results showed that MoO 3 and V 2 O 5 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. MoO 3 and V 2 O 5 co-doping increased grain size (to about 20 μm) and sintered density (to about 4.8 g/cm 3 ) and also decreased power loss noticeably at sintering temperatures between 900 and 1200 °C.