Influence of PbO and TiO2 additives on the microstructure development and magneticproperties of Ni–Zn soft ferrites

This paper focuses on the effect of PbO and TiO_2 on the magnetic properties and microstructural development of Fe_2Ni_0.64Zn_0.36O_4 soft ferrite. Ferrite was added to these oxides, ranging from 0 to 3.2 wt% in steps of 0.4 wt%. The results showed that with increasing the amount of PbO up to a certain percentage, relative density, grain size and magnetic permeability increase and then decrease. This additive caused to increase DC-resistivity, power loss and decrease in magnetic permeability and saturation magnetization. TiO_2 revealed no considerable effect on the grain growth and densification. In contrast this additive due to the doping of the high valent Ti^4+ ions to the lattice affects the magnetic and electrical properties noticeably. TiO_2 improved the loss properties (up to 1.2 wt%) and magnetic permeability (up to 2.0 wt%) but reduced the saturation magnetization, and DC-resistivity of ferrite.