Glasses in the system, 3TeO2xLi2O(1-x)V2O5, were prepared with x-values ranging from 0 to 1. The conductivity data exhibited an Arrhenius-type behaviour between room temperature and the glass transition temperature. The isothermal conductivity curves exhibited a sharp minimum near to x = 0.5. The values of the activation energies and pre-exponential factors in the V2O5-rich region were lower as compared with those in the alkali-rich region. This implied that the conductivity mechanisms in these 2 regions were different. The experimental values suggested that electronic conductivity via polaron hopping would prevail in the first region. In the alkali-rich region, ionic conduction was expected to occur via an interstitial-pair mechanism between non-bridging O-atoms. The very low conductivity at x = 0.5 could be explained by assuming that, for this composition, both ionic and electronic paths would no longer percolate.

Electronic to Ionic Conductivity of Glasses in the Li2O-V2O5-TeO2 System. G.D.L.K.Jayasinghe, M.A.K.L.Dissanayake, P.W.S.K.Bandaranayake, J.L.Souquet, D.Foscallo: Solid State Ionics, 1999, 121[1-4], 19-23