Impedance and Modulus studies of the solid electrolyte system 20CdI(2)-80[xAg(2)O-y(0.7V(2)O(5)-0.3B(2)O(3))], where 1 <= x/y <= 3

In the present work, an evaluation of the transport properties of super ion conducting quaternary system 20CdI(2)-80[xAg(2)O-y(0.7V(2)O(5)-0.3B(2)O(3))], where 1 <= x/y <= 3, in steps of 0.25, to study the effect of changing the modifier to former ratio on the conduction phenomena has been undertaken. Electrical conductivity measurements were made using complex impedance method. The electrical conductivity and conductivity relaxation of the system were studied in the temperature range from 303 K to 333 K and in the frequency range from 100 Hz to 10 MHz. The highest conductivity at room temperature is obtained for the system with modifier to former ratio 1.75. Impedance and modulus analyses had indicated the temperature independent distribution of relaxation times and the non-Debye behavior in these materials. The co-operative motion due to strong coupling between the mobile Ag+ ions is assumed to give rise to non-Debye type of relaxation. The silver ionic transport number (t(Ag+)) obtained by the emf technique suggested the occurrence of silver ion conduction in the CdI2-doped Ag2O-V2O5-B2O3 system. (c) 200

Electrical transport studies on CdI2 doped silver oxysalt system

A new glass system xCdI(2)-(100 - x)[2Ag(2)O-(0.7V(2)O(5)-0.3B(2)O(3))], 5 less than or equal to x less than or equal to 20, has been prepared by melt quenching technique. The electrical conductivity studies of the samples have been carried out at different temperatures and frequencies. The transport number of the Ag+ determined by the emf method is 0.98. The frequency dependence of electrical conductivity has been analyzed by Jonscher's power law. Data were analyzed in terms of permittivity and modulus formalisms. The modulus spectra of the present system suggest a distribution of the relaxation time, which is found to be temperature independent. The cooperative motion due to strong coupling between the mobile Ag+ ions are assumed to give rise to the non-Debye type of relaxation. The behavior of ac conductivity and relaxation phenomenon can be explained by the diffusion controlled relaxation (DCR) model proposed by Elliott. (C) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved