Abstract
Most of crystalline materials do not show dielectric loss peak due to high dc conductivity contribution to the dielectric loss of material. The PVA/PVP hydrogel synthesized nano-crystalline Cerium oxide (CeO2) for a temperature range 413-553K shows dielectric relaxation at higher frequencies with dc conductivity contribution. Impedance spectroscopic data of the material are studied with combined Cole-Cole type conduction and dielectric relaxations and the electrical parameters are found to be independent of ac data representations. DC conductivity σc, conduction relaxation time τc and dielectric relaxation time τd shows Arrhenius behavior. Hopping of charge carriers and kinetics of disordered host matrix produces a combined relaxation in the material.
Published Version
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