Effect of annealing temperature on structural and dielectric properties of bismuth ferrite nanostructures

Abstract

In the present work, we have synthesized BiFeO3 nanostructures via Sol-gel method and investigated the effect of annealing temperature on structural and dielectric properties. The structural and morphology study of as synthesized and annealed samples was carried out by using X-Ray Diffractometer (XRD) and scanning electron microscope (FESEM). The XRD spectra of all the samples annealed at different temperature revealed that all the peaks correspond to the characteristic peaks of R3C phase of BiFeO3 indicating a single-phase rehombohedral crystal structure of BiFeO3. The crystallite size for sample T3 is 22 nm. The band gap of all BFO (T1, T2 and T3) sample were estimated by Uv-visible spectrography, which is 1.9 eV, 2.1 eV and 2.3 eV respectively. The dielectric properties of all the samples have been evaluated over a frequency range (5MHz-10Hz) by temperature dependent complex impedance spectroscopic analyzer.