Determination of Activation Energies from Complex Impedance Parameters of Microwave Sintered NiMgZn Ferrites

The Ni0.2Mg0.8-xZnxFe2O4 (x = 0.2, 0.4, 0.6 & 0.8) ferrites are prepared via microwave double sintering solid state reaction method. The phase purity and structure are confirmed by diffraction studies. These investigations reveal that the lattice parameter as well as crystallite sizes are increasing with zinc content. In addition, the variation of complex impedance (Z*) parameters as a function of temperature and frequency is studied. The activation energies of ferrites are evaluated from Arrhenius plots and observed to be decreasing with increase of x value.