Author : Soumya Mukherjee

Solution chemistry is utilized to synthesize three perovskite-spinel nanocomposites at optimized conditions. PL spectral analysis is carried to observe luminescence of the above synthesized nanocomposites after excitation at same Laser light intensity (Xe Laser, 150 W) at constant scanning rate in Spectrofluorometer. Excitations are observed to be about 250 nm with variable peak intensities for three different nanocomposites and also observed to be different with respect to individual perovskite, spinel phases. BFO-NFO exhibits intermediate PL intensity, whereas BFO-CFO have highest intensity level and that of BFO-ZFO is observed to have the lowest intensity among the three nanocomposites. Dielectric measurements have shown space charge polarization of these samples in terms of loss tangent and Cole-Cole plot. It is primarily related to Maxwell-Wagner type interfacial polarizations arising from prominent grain boundary contributions due to nanocrystalline sizes of respective phases. P-E loop analyses of the most prominent results are analysed to realize the presence of ferroelectric nature among the three nanocomposites. Among the three nanocomposites, BFO-NFO is lossy capacitor, non-linear ferroelectric nature, BFO-CFO lossy capacitor, resistive one while that of BFO-ZFO towards hard ferrite type behaviour.

Keywords: Perovskite-Spinel, PL spectra, Dielectric, P-E loop

Article published in International Journal of Current Engineering and Technology, Vol.7, No.2 (April-2017)