The effect of Al2O3-doping upon ionic conductivity in the glass system, Li2O-Al2O3-TiO2, was investigated by using differential scanning calorimetry and alternating-current impedance spectroscopy. Glass samples having the general molar composition, (50+x)Li2O-xAl2O3-(10-2x)TiO2-40P2O5 (where x ranged from 0 to 4.5), were prepared by air-quenching melts. The highest conductivity at 350C (0.02S/cm) and lowest activation energy (0.50eV) were found for x = 0.5. This composition also exhibited the greatest stability against crystallisation. The behaviour of cast, powdered and crystallised glasses was examined. At x = 0.5, the conductivity of the crystallised cast glass at room temperature exceeded that of the parent glass.

Lithium Ion Conductivity and Thermal Behaviour of Glasses and Crystallised Glasses in the System Li2O-Al2O3-TiO2-P2O5. I.Abrahams, E.Hadzifejzovic: Solid State Ionics, 2000, 134[3-4], 249-57