Structural, Dielectric, Ferroelectric and Magnetic Properties of (x) CoFe2O4-(1-x) BaTiO3 Composite

Composites of (x) CoFe2O4-(1-x) BaTiO3 (for x = 0, 0.30, 0.40, 0.50) synthesized via solid state reaction method are reported. Structural analysis was carried out by X-ray diffraction analysis which confirms the formation of the hybrid composites with spinel phase and tetragonal phase. FESEM micrographs show closely packed microstructure with grain sizes varying in the range of 480 nm- 680 nm. Variation of dielectric constant with temperature at three fixed frequencies (1 kHz, 50 kHz and 100 kHz) was studied and it was found that the value of dielectric constant increases with an increase in the ferrite content. In ferroelectric study the values of coercive field (2E(c)) increased with increasing ferrite content. The magnetic properties such as saturation magnetization (M-s) and magnetic moment (mu(B)) calculated from the magnetic hysteresis loops are found to increase with an increase in ferrite content. The magnetoelectric effect of ferroelectric/ferrite composites was studied using magnetocapacitance which gives maximum value for 50 mol% addition of ferrite.