Cyclic voltammetry and impedance spectroscopy studies of silver vanadate phosphate glasses

Electrical and electrochemical properties of the glasses of the AgI–Ag2O–V2O5–P2O5 system were characterized by impedance spectroscopy and cyclic voltammetry. The observed correlation between the results obtained by these two methods was analyzed. It was found that for compositions with high content of V2O5 and low of Ag2O and AgI, samples are electronic conductors. For these compositions, voltammograms are linear. At higher contents of AgI, when glasses become electronic–ionic conductors, impedance spectra contain Warburg-like diffusional part and voltammograms reveal some hysteresis. Finally at high contents of AgI and Ag2O impedance spectra indicate blocking effects at the electrodes. Voltammograms of these glasses contain anodic and cathodic peaks.