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Effects of the Sintering Temperature on RF Complex Permeability of NiCuCoZn Ferrites for Near-Field Communication Applications

The effect of bismuth oxide (Bi2O3) and sintering temperature on NiCuCoZn ferrite powders has been investigated for the near-field communication applications. The powders were prepared by conventional solid-state synthesis method. The microstructure and frequency-dependent complex permeability were investigated. Employment of Bi2O3 as a sintering aid promotes uniform grain growth and densification in sintered powders, which in turn has affected complex permeability spectra. It has been observed that the addition of Bi2O3 decreases permeability and magnetic loss from 147 to 110 and from 0.03 to 0.02, respectively, which were both sintered at 1100 °C and measured at 13.56 MHz frequency as compared to undoped sample (without Bi2O3). Also, permeability and magnetic loss were increased with sintering temperature. Complex permeability and resonance frequency follow the Globus model.