Study of structural, dielectric and magnetic behaviour of Ni0.75Zn0.25Fe2O4–Ba(Ti0.85Zr0.15)O3composites

A class of hybrid composites ( x )Ni 0.75 Zn 0.25 Fe 2 O 4 –(1 − x )Ba(Ti 0.85 Zr 0.15 )O 3 (for x variations 0, 0.20, 0.30 and 0.40) synthesized via a solid state reaction method is investigated. The structural analysis was carried out using an x-ray diffraction graph which reveals a mixed phase of the hybrid composites with spinel phase for ferrite component and perovskite phase for the ferroelectric component. The microstructural analysis and grain size determination is carried out using a field emission scanning electron microscope (FESEM). The relative dielectric constant with frequency variation (in the range of 100 Hz–1 MHz) and temperature at three fixed frequencies (100 Hz, 1 KHz and 10 KHz) is studied. The magnetic properties such as saturation magnetization ( M s ) and magnetic moment (μ B ) are calculated from the magnetic hysteresis loops obtained using a vibrating sample magnetometer (VSM). The value of remnant polarization for pure BZT is found to be 6.18 μC cm −2 and as the content of ferrite phase is increased up to 40 mol%, this value decreases. The magnetoelectric effect is studied using magnetocapacitance which takes a maximum value for 40 mol% addition of ferrite.