Lithium ion transport in germanophosphate glasses

Glasses in the system Li2O - GeO2 - P2O5 have been prepared using melt quenching route. Li+ ion transport has been investigated in these glasses using both d.c. and a.c. conductivity measurements. Arrhenius plots of d.c. conductivity exhibits two different slopes, which has been discussed in the light of cluster-tissue model. A.c. conductivity data has been fitted to single power law. Dielectric relaxation has been analyzed based on the behaviour of moduli. Good collapse on to master plots is observed for both a.c. conductivity and moduli. The behaviour of E-dc, s and beta are found to be consistent when conductivity mechanism is considered as involving NBO-BO switching as the first step, which is followed by Li+ ion migration. (C) 2004 Elsevier B.V. All rights reserved.