Magnetic properties and densification of Manganese–Zinc soft ferrites (Mn1-xZnxFe2O4) doped with low melting point oxides

Mn–Zn ferrites have high electrical resistivity, low power loss and high initial permeability up to several MHz range. Oxide additives can greatly affect the magnetic properties of these ferrites. The effects of the additives on the sintering behaviour and magnetic properties of Mn–Zn ferrites are different. Some low melting point additives such as Bi2O3 enhance the sintering by forming a liquid phase in the ferrites. The additive V2O5 enhances the sintering by increasing bulk diffusion due to the increased vacancy concentration which is accompanied by the solubility of V5+ in the ferrites. Some additives are cations that are soluble in the host lattice and enter regular positions on the tetrahedral or octahedral sites. This paper investigates the effect of several low melting point oxides on the magnetic properties, microstructure and densification of Mn–Zn soft ferrites.