Structural, Dielectric and Ferroelectric Studies of (x) Mg_(0.25)Cu_(0.25)Zn_(0.5)Fe_2O_4 + (1-x) BaTiO_3 Magnetoelectric Nano-Composites

摘要

The Particulate nano-composites of ferrite and ferroelectric phases having the general formula (x) Mg_(0.25)Cu_(0.25)Zn_(0.5)Fe_2O_4 + (1-x) BaTiO_3 (x=15%, 30% and 45%) were synthesized by sintering mixtures of highly ferroelectric BaTiO_3 (BT) and highly magneto-strictive magnetic component Mg_(0.25)Cu_(0.25)Zn_(0.5)Fe_2O4(MCZF). The presence of constituent phases of ferrite, ferroelectric and their composites were probed and confirmed by X-ray diffraction (XRD) studies. Surface morphology of the samples has been investigated using Field Emission Scanning Electron Microscope (FESEM). The variation of dielectric constant and dissipation factor as a function of frequency from 100 Hz to 1 MHz at room temperature were carried out using a Hioki LCR Hi-Tester. The dielectric constant and dielectric loss were found to decrease rapidly in the low frequency region and became almost constant in the high frequency region. The electrical conductivity deduced from the measured dielectric data has been thoroughly analyzed and found that the conduction mechanism in these composites is in conformity with small polaron hopping model. The ferroelectric properties of synthesized magneto-electric nano-composites were measured using P-E loop tracer.