Glass-transition Temperature and Electrical-conductivity of (1 + X)Ag2O.yB2O3.(1 - Y)P2O5.AgI Glasses

Glasses of the formula (1 + x)Ag2O.yB2O3.(1 - y)P2O5.AgI (0 less-than-or-equal-to x less-than-or-equal-to 0.6, 0 less-than-or-equal-to y less-than-or-equal-to 0.2) have been prepared and their glass transition temperatures taken from differential thermal analysis curves. Electrical conductivities have been measured in the temperature range 25-80-degrees-C by means of the usual impedance analysis, and the parameters of an Arrhenius type of conductivity equation are reported. The substitution of B2O3 for P2O5 has proved to be useful in raising both T(g) and sigma of the glasses. Plots of composition against T(g) support the idea of a network comprising polyphosphate or polyborophosphate units and iodide ions. The electrical properties can be well described within the context of the diffusion path model and the experimental data suggest that Ag+ migration paths may involve sites other than those near I- ions.