Glasses in the system Li2O–GeO2–P2O5 were prepared by using melt quenching route. Li+ ion transport was investigated in these glasses using both direct- and alternating-current conductivity measurements. Arrhenius plots of the direct-current conductivity exhibited 2 different slopes, which was explained in terms of the cluster-tissue model. The alternating-current conductivity data was fitted to a single power law. Dielectric relaxation was analyzed, based upon the behaviour of moduli. Good collapse on to master plots was observed for both the alternating-current conductivity and the moduli. The data were found to be consistent when the conductivity mechanism was considered to involve NBO–BO switching as the first step; followed by Li+ ion migration.

Lithium Ion Transport in Germanophosphate Glasses. S.Kumar, K.J.Rao: Solid State Ionics, 2004, 170[3-4], 191-9