Effect of microstructure on magneto-capacitance of [80 wt%BaFe12O19 (BaM)-20 wt% Na0.5Bi0.5TiO3 (NBT)] composite system

Four novel composite systems having composition “80 wt% BaFe12O19 (BaM)-20 wt% Na0.5Bi0.5TiO3 (NBT)” were prepared by solid state reaction technique with considering the variation of microstructure for both the phases. The formation of desired composite systems was confirmed by X-ray diffraction study. From SEM and FESEM images it was found that both the phases are well connected with each and forming 0-3 type particulate composite. From the magneto-capacitance data it was observed that, the composite system which have larger size (≈ micron range) matrix phase (BaM) and smaller size (≈ nano range) disperse phase has highest extrinsic magneto-capacitance (MC %) effect than others. In this report we were also tried to predict the intrinsic magneto-electric coupling in these four composite systems with the help of magneto-impedance spectroscopy.