Dielectric, magnetic, and magnetodielectric properties of x[Co0.9Ni0.1Fe2O4]-(1−x)[0.5(Ba0.7Ca0.3)TiO3)-0.5Ba(Zr0.2Ti0.8)O3] multiferroic composites

Abstract

Multiferroic nanocomposites x[Co0.9Ni0.1Fe2O4]-(1−x)[0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3], x = 0.1, 0.2, 0.3, 0.4, have been prepared by the co-precipitation method followed by microwave sintering. The properties of the sintered composites were investigated using different techniques, namely, structural, micro-structural, dielectric, magnetic, and magnetodielectric analyses. X-ray diffraction analysis confirms the perovskite phase and spinal phase. The dielectric constant and loss factor of the composites were studied as a function of frequency and temperature. It is observed that the dielectric constant has two anomalies: one corresponds to ferroelectric to paraelectric transition below ∼130 °C of BCT–BZT and second is the magnetic transition of CNFO above ∼450 °C. Both the ferroelectric and ferromagnetic behaviours of the composites were observed at room temperature with strong dependence on the content of magnetic material. Saturation magnetization (Ms) increases with increase in the content of CNF...