Complex impedance, dielectric properties and electrical conduction mechanism of La0.5Ba0.5FeO3-δ perovskite oxides

The new perovskite compound La0.5Ba0.5FeO3-delta was prepared by the sol-gel method. The Rietveld refinement, from the X-ray diffraction pattern, proved that the sample presents single phase type cubic structure at room temperature. In addition, electrical properties were performed using complex impedance spectroscopy (CIS) technique as a function of frequency (100 Hz to 7 MHz) at various temperatures (278-573 K). As a matter of fact, impedance analysis was performed using the equivalent circuit model and it indicated the presence of a single semicircle arc. Furthermore, the obtained results of the AC conductivity have been discussed in terms of the non-overlapping small polaron tunneling (NSPT) model. Finally, it is worth mentioning that the conductivity of our investigated perovskite oxide was found to be sigma(573) = 1.23 x 10(-2) Omega(-1) cm(-1). These results confer to this material a potential application as a cathode material.