Add time:09/01/2019         Source:sciencedirect.com

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 Rb2HAsO4Te(OH)6 (Rb As Te), we have carried out complex impedance spectroscopy technique in the frequency range 200 Hz–5 MHz at various temperatures (304 K–493 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. The experimental data shows that the ac conductivity of this compound is proportional to ωs (s < 1), the value of s is temperature-dependent.The conductivity evolution versus temperature reveals the presence of the super-ionic- protonic conduction phase transition. The dielectric properties's dependence on both temperature and frequencies of the compound has been reported. The ionic-protonic conductivity and conductivity relaxation calculated from the impedance and modulus spectra respectively were found to be thermally activated. The conductivity relaxation parameters of some H+ and Rb+ conducting in the RbAsTe material have been determined from an analysis of AC conductivity data measured in a wide temperature range. 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 H+ ion in the structure of the investigated material, thus the displacement of the Rb+ cations at the level of the tunnels.

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