Abstract
Complex perovskite lanthanum calcium lead iron oxide compounds with the composition La0.8Ca0.2-xPbxFeO3 (x = 0.05, 0.10 and 0.15) were synthesized by the sol–gel method using the citric acid route. X-ray diffraction patterns showed that the nanosize crystalline powders present an orthorhombic symmetry with Pnma space group. Impedance spectroscopy was used to characterize the electrical behavior of these materials as a function of frequency (102–106 Hz) at various temperatures (30–400 °C). The imaginary part of the complex impedance (Z″) frequency dependence revealed one relaxation peak. The Cole–Cole plots of the impedance values exhibited a semi-circular arc that can be described by an (R1CPE1)//(R2C1) electrical equivalent circuit. The frequency dependence of the conductivity has been investigated with the Jonscher universal power law. The ac electrical conduction was studied and associated to the non-overlapping small polaron tunneling (NSPT) model.
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