The Ag2O–TiO2–SiO2 glasses were prepared by Ag+/Na+ ion-exchange method from Na2O–TiO2–SiO2 glasses at 380 to 450C below their glass transition temperatures, and their electrical conductivities were investigated as functions of TiO2 content and the ion-exchange ratio, Ag/(Ag+Na). In a series of glasses, 20R2O·xTiO2·(80-x)SiO2, with x = 10, 20, 30 or 40mol%, the electrical conductivities at 200C of the fully ion-exchanged glasses with R = Ag were of the order of 10-5 or 10-4S/cm and were 1 or 2 orders of magnitude higher than those of the initial glasses with R = Na. The glass with x = 30 exhibited the highest increase of conductivity, from 3.8 x 10-7 to 1.3 x 10-4S/cm at 200C by Ag+/Na+ ion exchange among them. When the ion-exchange ratio was changed in the 20R2O·30TiO2·50SiO2 system, the electrical conductivity at 200C exhibited a minimum value of 7.6 x 10-8S/cm at around Ag/(Ag+Na) = 0.3, and increased steeply in the region of Ag/(Ag+Na) = 0.5 to 1.0. When the ion-exchange temperature was changed from 450 to 400C, the conductivity of the ion-exchanged glass of x = 30 decreased. Infra-red spectroscopy measurements revealed that the ion-exchange temperature of 450C induced a structural change in the glass of x = 30. The Tg of the fully ion-exchanged glass of x = 30 was 498C. It was suggested that the incorporated Ag ions changed the average coordination number of Ti ions to form higher ion-conducting pathway and resulted in high conductivity in the titanosilicate glasses.

Electrical Conductivity of Ag+/Na+ Ion-Exchanged Titanosilicate Glasses. F.Funabiki, T.Yano, S.Shibata, M.Yamane: Solid State Ionics, 2003, 160[3-4], 281-8