Effect of La and Pb substitution on structural and electrical properties of parent and La/Pb co doped BiFeo3 multiferroic

Abstract

La/Pb co-doped BiFeO3 compounds were prepared by a solid-state reaction. X-ray diffraction of BiFeO3 (BFO), Bi0.725La0.1Pb0.175FeO3 [BLPFO] showed single phase in nature. BFO crystallize in the rhombohedral distorted perovskite structure (space group-R3c) while to that BLPFO crystallize in distorted pseudocubic (Pm-3m) symmetry which has been confirmed by the Rietveld refinement of the room temperature X-ray powder diffraction data. The effect of La/Pb substitution on dielectric constant, and loss tangent, of the samples was studied at room temperature in a wide range of frequency 10 Hz - 1 MHz. The room temperature dielectric constant of BFO (BLPFO) was ≈ 120 (200). Ferroelectric measurement reveals remnants polarization of BLPFO is about 0.24 μC/cm2 at an applied field of 15 kV/cm. Weak ferroelectric effect is observed for co-doped BiFeO3 compound. © 2014 VBRI press.