Magnetodielectric Effect in Microwave-Sintered Ba0.8Sr0.2TiO3 and Co0.9Ni0.1Fe2O4 Composite

Composites constructed by combining ferroelectric and ferromagnetic materials are of significant interest owing to their multifunctional features and potential applications in multifunctional devices. Herein, the magnetodielectric effect of a composite containing ferroelectric Ba0.8Sr0.2TiO3 (BST) and ferrite Co0.9Ni0.1Fe2O4 (CNFO) phases is investigated. This ferroelectric and ferrite composite is synthesized using the co-precipitation method followed by microwave sintering. The tetragonal crystal structure of BST and cubic structure of CNFO are confirmed using X-ray diffraction. All composite samples are characterized using nanoparticle tracking analysis. The measurements of dielectric constant (room temperature) and loss tangent as a function of frequency show an increase in the dielectric constant with an increase in the CNFO phase. The highest value of magnetodielectric coefficient, -40.13 %, is observed for the 60BST-40CNFO composite at 100 Hz, which decreases with an increase in the applied frequency.