Overlapping Large Polaron Conductivity Mechanism and Dielectric Properties of Al0.2Cd0.8Fe2O4 Ferrite Nanocomposite

In this work, the conduction and dielectric properties of Al 0.2 Cd 0.8 Fe 2 O 4 ferrite nanoparticle, which was synthesized by a co-precipitation method, were investigated. Experimental data were taken from 20 Hz to 10 MHz and from 293 to 613 K. AC conductivity of the sample was analyzed within the framework of the overlapping large polaron tunneling (OLPT) mechanism. DC conductivity behavior fits the classical Arrhenius-type conductivity in the examined temperature range. Electrical properties of the material sample have been studied using an impedance spectroscopy technique. The effect of frequency and temperature on dielectric constant ( ε ′ ), dielectric loss (tan θ ), and impedance ( Z ′ and Z ′′) has been discussed in terms of hopping of charge carriers between Fe 2+ and Fe 3+ ions. According to results, a relaxation process fits the Cole–Cole model.