The alternating-current conductivities of AgI-based fast ion conducting glasses with differing P-O or B-O network structures, but with the same AgI concentration (1.55 x 104mol/m3), were measured at temperatures which ranged from 14 to 400K (AgI-Ag2O-P2O5) or from 100 to 200K at 10Hz to 1MHz (AgI-Ag2O-B2O3). It was found that the development of the network structure of the glass former at a given AgI concentration resulted in a decrease in the activation energy for the diffusional motion of Ag+ ions and in an increase in the heat-capacity jump that was associated with the glass transition. The results supported an amorphous AgI aggregate model for the structure of the conductive region in glasses with relatively high AgI concentrations. This indicated that Ag+-ion conductivity was governed mainly by the degree of development of the AgI aggregate region, which depended upon the glass-former network structure as well as upon the AgI composition.

M.Hanaya, M.Nakayama, A.Hatate, M.Oguni: Physical Review B, 1995, 52[5], 3234-40