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 mu m) and sintered density (to about 4.8 g/cm(3)) and also decreased power loss noticeably at sintering temperatures between 900 and 1200 degrees C. (C) 2007 Published by Elsevier B.V.