It was noted that AgI-AgPO3 glasses were an interesting model system in which to study the relationships between carrier density and mobility, transport mechanism and medium-range order in fast ion-conducting glasses. An anomaly, observed in the direct-current conductivity behaviour below room temperature, was considered. This anomaly was related to the opening of percolative channels for AgI contents greater than 30mol%. Solid-state 109Ag nuclear magnetic resonance measurements on the 1:1 AgI:AgPO3 glass permitted the determination of the change in the number of mobile carriers over the whole temperature region where the anomaly was observed.

Low-Temperature Ionic Conductivity in AgI-AgPO3 Glasses. C.Tomasi, P.Mustarelli, M.P.I.Garcia, A.Magistris, A.Mandanici: Philosophical Magazine B, 2002, 82[4], 475-83