Effect Of La And Pb Substitution On Structural And Electrical Properties Of Parent And La/Pb Co Doped BiFeO3 multiferroic
Poorva Sharma, Dinesh Varshney
Volume 5, Issue 2, Page 71-74, Year 2014 | DOI: 10.5185/amlett.2013.fdm.10
Multiferroics; X-ray diffraction; dielectric properties; ferroelectric loop.
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. Copyright © 2014 VBRI press.