Structural, dielectric and magnetic studies of ferrite-ferroelectric composites

Abstract

The composites of ferrite-ferroelectric system (x) Mg0.2Cu0.5Zn0.3Fe2O4 + (1-x) BaTiO3 (x = 15%, 30% and 45%) were synthesized by sintering the mixtures of ferroelectric BaTiO3 (BTO) and ferrite component Mg0.2Cu0.5Zn0.3Fe2O4 (MCZF). Ferrimagnetic MCZF was prepared using auto-combustion method where as ferroelectric BTO was procured commercially from Sigma-Aldrich. The presences of two phases in magneto-electric composites were probed by X-ray diffraction (XRD) studies. The peaks observed in the XRD spectrum indicated spinel cubic structure for MCZF ferrite and tetragonal perovskite structure for BTO and, both spinel and pervoskite structures for synthesized composites. Surface morphology of the samples has been investigated using Field Emission Scanning Electron Microscope (FESEM). Frequency dependent dielectric properties of synthesized composites were measured from 100 Hz to 1 MHz at room temperature (RT) using HIOKI LCR HI-TESTER. The dielectric dispersion is observed at lower frequencies for the synthesized ME composites. The magnetic properties of synthesized composites were analyzed using a Vibrating Sample Magnetometer. It is observed that the composites exhibited magnetic hysteresis with narrow loops indicating the magnetic ordering in the composites. All the measurements were carried out at room temperature. © 2019