Electric, thermodynamic and NMR evidence of anomalies in (x)AgI(1−x)AgPO3 glasses

Anomalies in the (x)AgI(1−x)AgPO3 glasses for x≈0.3 are observed in the electric properties, molar volume and also local probes like the 31P NMR longitudinal relaxation time. These anomalies can be explained in terms of the opening of percolative channels among the metaphosphate chains, which are subsequently filled by the dissociated Ag+ and I− ions. An attempt to reconcile the different data on activation energy for dc conductivity and glass transition temperature reported in the literature is also made.