Abstract
The effects of TiO2 and Co2O3 combination additions on the elemental distribution and electromagnetic properties of Mn–Zn power ferrites are investigated. TiO2 addition can promote Co2O3 transfer from grain boundaries to the bulk of the grains. The temperature at which the highest initial permeability μi and the lowest power losses PL appear shifts to low temperature range with the increase of Co2O3 content. Compared with the reference sample without TiO2 and Co2O3 addition, the microstructure and electromagnetic properties of Mn–Zn power ferrites can be considerably improved with suitable amounts of TiO2 and Co2O3 combination additions. At the peak temperature, the sample with the 0.1wt% TiO2 and 0.08wt% Co2O3 additions has an increase of 15.8% in μi to 3951, and a decrease of 22.9% in PL to 286kW/m3. The saturation magnetic induction Bs and electrical resistivity ρ at 25°C reach the highest values of 532mT and 8.12Ωm, respectively.
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