EQUIVALENT-CIRCUIT MODELING OF THE AG-VERTICAL-BAR-AS0.24S0.36AG0.40-VERTICAL-BAR-AG SYSTEM PREPARED BY PHOTODISSOLUTION OF AG

An impedance spectroscopy study of the Ag\As0.24S0.36Ag0.40\Ag system has been performed, yielding an equivalent circuit model describing Ag + transport and reaction processes in the bulk electrolyte and at the electrodes. The unsupported solid electrolyte exhibits characteristic finite length Warburg impedance in series with a solution resistance a nd an electric double layer, all in parallel with a geometric capacita nce. By varying the electrode area and separation, the efficacy of the equivalent circuit model is demonstrated by the accuracy with which t he model predicts changes in the impedance spectra. These results help explain the ionic behavior of Ag+ in Ag-doped chalcogenide glass and the associated microstructure of the solid electrolyte, further elucid ating the photodissolution process by which the ternary is prepared.