The complex impedance of super-ionic conducting glasses of the form, (AgX)0.3-(AgPO3)0.7, was measured at frequencies ranging from 5Hz to 500kHz and temperatures of between 299 and 348K. It was found that the frequency dependence of the real part of the complex conductivity exhibited 2 regions, at low and high frequencies. The former was attributed to electrode-electrolyte polarization, while the latter was attributed to bulk conduction. The replacement of AgCl, by AgBr or AgI with the same molar fraction, was found to improve the bulk conductivity of the glasses. The electrical conductivity spectra revealed a relaxation peak that was associated with dielectric losses which arose from the thermally activated jumping of Ag+ ions. The dependence of the relaxation time upon the type of halogen was explained in terms of structural aspects, in that the halides tended to form micro-domains.

Y.M.Moustafa: Journal of Materials Science - Materials in Electronics, 1995, 6[3], 135-9