Dynamics of ${\mathrm{Ag}}^{+}$ ions in ${\mathrm{Ag}}_2\mathrm{S}$-doped ${\mathrm{AgPO}}_3$ glasses have been studied in the frequency range $10\mathrm{Hz}$ to $2\mathrm{MHz}$ and in the temperature range $93–323\mathrm{K}$. The composition dependence of the dc conductivity and the activation energy of these glasses has been compared with that of the $\mathrm{AgI}$-doped ${\mathrm{AgPO}}_3$ glasses. An attempt has been made to explain the comparatively lower conductivity for the present ${\mathrm{Ag}}_2\mathrm{S}$ doped glasses than that for the $\mathrm{AgI}$-doped glasses by analyzing the Fourier transform infrared data. The frequency-dependent electrical data have been analyzed in the framework of conductivity formalism. We have obtained the mobile ion concentration and the power-law exponent from the analysis of the conductivity spectra. We have observed that the concentration of ${\mathrm{Ag}}^{+}$ ions is independent of temperature and the conductivity is primarily determined by the mobility. It has also been observed that a fraction of the ${\mathrm{Ag}}^{+}$ ions in the glass is involved in the dynamic process. Scaling of the conductivity spectra is observed to be independent of temperature and ${\mathrm{Ag}}_2\mathrm{S}$ content in the compositions.

• Received 11 November 2005

DOI:https://doi.org/10.1103/PhysRevB.73.104201