AC conductivity and dielectric behavior in lithium and sodium diphosphate LiNa3P2O7

This work presents some electrical properties based on the impedance measurements as well as the dielectric constants and electric modulus. In order to through light in the electrical conductivity and dielectric properties of LiNa3P2O7, we have carried out complex impedance spectroscopy technique in the frequency range 200 Hz-5 MHz at various temperatures (613-719 K). The complex impedance diagram at different temperatures showed a single semicircle, implying that the response originated from a single capacitive element corresponding to the grains. ac and dc conductivities were studied to explore the mechanisms of conduction. It can be seen from the experimental data that the ac conductivity of this compound is proportional to omega(s) (s < 1), the value of s is to be temperature-dependent, which has a tendency to decrease in temperature. Activation energy values deduced from both dc conductivity and hopping frequency are in the order of E-a = 0.95 eV and E-a = 0.89 eV respectively. The near value of activation energies obtained from the hopping frequency and equivalent circuit confirms that the transport is through ion hopping mechanism dominated by the motion of the Li+ ion in the structure of the investigated material. (C) 2013 Elsevier B. V. All rights reserved.