Dielectric relaxation and ionic conductivity studies of Na 2ZnP2O7

Abstract

The Na2ZnP2O7 compound was obtained by the conventional solid-state reaction. The sample was characterized by X-ray powder diffraction, infrared analysis and electrical impedance spectroscopy. The impedance plots show semicircle arcs at different temperatures and an electrical equivalent circuit has been proposed to explain the impedance results. The circuits consist of the parallel combination of bulk resistance Rp and constant phase elements CPE. Dielectric data were analyzed using complex electrical modulus M* for the sample at various temperatures. The frequency dependence of the conductivity is interpreted in terms of Jonscher's law. The conductivity σd.c. follows the Arrhenius relation. The near value of activation energies obtained from the analysis of M' and conductivity data confirms that the transport is through ion hopping mechanism, dominated by the motion of the Na+ ions in the structure of the investigated materials. © Indian Academy of Sciences.