Study of electrical and magnetic properties of Ba, la and Pb doped Bi _1-x-yDy_xC_yFe_1-yTi_yO ₃ perovskite ceramics

Polycrystalline sample of Bi_0.8Dy_0.1C _0.1Fe_0.9Ti_0.1O₃ (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 Bi _0.8Dy_0.1C_0.1Fe_0.9Ti _0.1O₃ system with Pb doping. It was seen that coercive field H_C and remnant magnetization M_R increase with for Pb but for La and Ba it decreases.