Influence of Ta2O5 Addition on the Properties of MnZn Power Ferrites

MnZn ferrites with the chemical formula Mn0.68Zn0.25Fe2.07O4 were prepared by conventional ceramic techniques. The influence of Ta2O5 addition on the microstructure and magnetic properties of MnZn ferrites was investigated. When the Ta2O5 addition is less than 0.04wt%, the grain size increases with the increase of Ta2O5 concentration, the initial permeability, saturation magnetic flux density and DC resistivity increase, the power losses and porosity decrease. However, excessive Ta2O5 addition (>0.04wt%) results in the exaggerated grain growth and porosity increase which make the initial permeability, saturation magnetic flux density and DC resistivity decrease, and the power losses increase. When the Ta2O5 addition is 0.04wt%, the initial permeability, saturation magnetic flux density and DC resistivity reach the maximum, the power losses and porosity reach the minimum.