Dielectric and Ferroelectric Properties of BaTiO3–CoFe2O4 Composites

In this research work, the influence of ferroelectric phase has been examined on the various physical properties of the ferrite phase. Composites with general formula (x) BaTiO3−(1−x) CoFe2O4 (x = 0, 0.25, and 0.5) were synthesized by mixing of BTO and CFO nanocrystalline powders via ball milling. The XRD analysis reveals that the composite structure consists of both perovskite and cubic spinel phases. Average crystallite size and micro-strain induced within the system have been investigated using Williamson-Hall method. Dielectric measurements divulge that the dielectric constant increases with the incorporation of BTO in the CFO matrix and follows typical dispersion behaviour. The polarization-field measurement manifests increment in the ferroelectric properties with the increasing percentage of BTO phase in the composite. The improved dielectric properties suggest BTO-CFO composite powders as potential candidate for dielectric resonators and dynamic random-access memories (DRAMs).