Study of electrical and magnetic properties of Ba, La and Pb doped Bi1−x−yDyxCyFe1−yTiyO3 perovskite ceramics

Polycrystalline sample of Bi0.8Dy0.1C0.1Fe0.9Ti0.1O3 (where C=Ba (DB), La (DL) and Pb (DP)) was prepared by a high-temperature solid state reaction technique. For the understanding of the multiferroic property, the relation between the crystal structures, magnetic transition and ferroelectric transitions with increasing temperature have been analyzed. X-ray diffraction analysis of the powders suggests the formation of a single-phase material with tetragonal structure. Studies of dielectric properties of the compound, studied in a frequency range 104-106 Hz at different temperatures (25-30 °C), exhibits two dielectric anomalies one at 225 °C and other around 375 °C (ferroelectric-paraelectric type transition). By using VSM technique, a significant change in the magnetic properties was observed in the Bi0.8Dy0.1C0.1Fe0.9Ti0.1O3 system with Pb doping. It was seen that coercive field HC and remnant magnetization MR increase with for Pb but for La and Ba it decreases.