Alternative current conduction, dielectric behavior, transport properties and Mössbauer study of LaBaFe0.5Ti0.5MnO6-δ new compound
Résumé
The new perovskite compound with formula LaBaFe0.5Ti0.5MnO6-δ was prepared by the sol-gel method using the citric acid route. The analysis of X-ray diffraction pattern using Le Bail method allows to conclude unambiguously that the sample exhibits single phase type cubic structure at room temperature. Electrical properties were studied using complex impedance spectroscopy as a function of frequency (100 Hz–7 MHz) at various temperatures (278–573 K). Impedance analysis has shown the grain contribution using an equivalent circuit model. The frequency dependence of the AC conductivity followed the universal power law variation. The values of activation energies obtained from the analysis of M″, conductivity data and equivalent circuit are too close and confirm that the sample behaves as a semiconductor. The plot of pre-exponent s versus temperature of the sample suggests that the conduction mechanism can be described using the non-overlapping small polaron tunneling model (NSPT) model. The Mössbauer measurements showed a paramagnetic behavior with the presence of only HS Fe3+ at 300 and 77 K.