Magnetodielectric effect in microwave-sintered ba_0.8sr_0.2tio₃ and co_0.9ni_0.1fe₂o₄ 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 Ba_0.8Sr_0.2TiO₃ (BST) and ferrite Co_0.9Ni_0.1Fe₂O₄ (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.