Structural characterisation and transport studies of AgI-Ag2O-(MoO3+As2O5)glass system

Glasses in the silver molybdoarsenate (SMA) system were prepared in differe nt compositions by the melt quench method. Prepared compounds were characte rised by x-ray diffraction (XRD), infrared (IR) and differential scanning c alorimetry (DSC). Electrical conductivity was measured on SMA compounds as a function of frequency (6.5 Hz-65 kHz) and temperature up to just below th e glass transition temperature (T-g). Electronic conductivity, transport nu mber and thermoelectric power measurements were made on the highest conduct ing (sigma =1.65x10(-2) S/cm) SMA system. The electronic conductivity and t ransport number of the mobile charge carriers in the SMA system were found to be 4.29x10(-8) S/cm and 0.999, respectively. The heat of transport (0.37 eV) and type of mobile charge (Ag+) carrier in the SMA system were obtaine d from thermo-electric power measurements and the heat of transport (0.37 e V) was correlated with the activation energy (0.33 eV) obtained from the te mperature dependence of conductivity plots. The variation of conductivity w ith AgI composition is correlated with the DSC and infrared results and poi nt to a simple conduction mechanism.