Electrical conduction and dielectric properties of a newly synthesized single phase: Ag0.4Na0.6FeP2O7

The new compound diphosphate Ag0.4Na0.6FeP2O7 has been investigated by X-ray diffraction, vibrational and impedance spectroscopy. Rietveld refinements based on the XRD patterns indicate the formation of a single-phase type monoclinic structure. The impedance plot has shown semicircle arcs at different temperatures and in order to explain the impedance results, an electrical equivalent circuit has been proposed. Besides, the frequency dependence of the conductivity is interpreted in terms of jonscher's law. The activation energies have been calculated at the levels of: impedance, electric modulus studies and dc conductivity which suggests that the conductions are ionic in nature. The ionic conductivity ascribed to the Na+ and Ag+ ions motion is discussed on the basis of the structural characteristics of the sample. Also, it has been found that, the power law exponent, s, is temperature dependent and the CBH model is the most applicable conduction mechanism in the title compound. (C) 2014 Elsevier B.V. All rights reserved.