Careful calorimetric measurements were performed on (AgI)x(AgPO3)1–x and (AgI)x(Ag2PO3.5)1–x glasses with x ≥ 0.75. The glasses exhibited β-glass transitions, due to the freezing-in of rearrangements of conductive Ag+ ions. The size of the associated heat-capacity jump increased with increasing AgI composition in a given glass system, and was greater in the former system than in the latter; when compared at the same AgI content. All of the results could be well explained in terms of the so-called amorphous AgI aggregate model for AgI-based fast ion conducting glasses; thus indicating the suitability of the model for treating the structures of glasses with high AgI contents. The formation of hypothetical bulk amorphous AgI was also suggested in glasses with the highest limit of AgI content.

Formation of Amorphous AgI Aggregates Dominating Fast Ion Conductivity in AgI-Based Glasses. M.Hanaya, A.Hatate, M.Oguni: Journal of Thermal Analysis and Calorimetry, 1999, 57[3], 773-85