Structure and transport properties of glasses in the system CdI<inf>2</inf>-Ag<inf>2</inf>O-V<inf>2</inf>O<inf>5</inf>

Glassy systems x CdI2 - (100-x) (2 Ag2O - 1 V2O5), 5 ≤ x ≤ 20 have been prepared and characterized by X-ray diffraction and differential scanning calorimetry. Frequency dependent complex impedance had been measured from 100 Hz to 100 kHz for various compositions at different temperatures. The observed frequency dependent conductivity could be attributed to the Johnscher's power law dependence. Complex permittivity ε* and complex modulus M* have been studied for x = 20 mole% CdI2 at different temperatures. DC conductivity at room temperature (303 K) for the above system with 20 mole% CdI2 is found to be 1.26 × 10-3 S/cm. The dielectric loss ε* shows 1/ω dependence on frequency. The modulus spectra have shown a long tail in the low frequency region and a tendency to peak at higher frequencies. IR spectroscopy studies on these glasses indicate that the oxyanion network is unaffected by the addition of CdI2. Transport number of the mobile species has been determined by the e.m.f. method. The above transport and structural studies indicate the presence of AgI clusters which contribute to high Ag+ ion conductivity.