Time and Composition Dependent Electrical Conductivity of Vanadate Glasses Showing Both Cationic Conduction and Electronic Conduction

Silver vanadate glasses show electrical conductivity higher than 10–2 S cm–1, caused by the electron hopping from VIV to VV together with an ionic conduction due to Ag+. Lithium vanadate glasses show electrical conductivity of the order of 10–6 S cm–1 which is primarily due to an electron hopping from VIV to VV. Fraction of the Ag+ or Li+ conduction and that of electron hopping from VIV to VV can be estimated by measuring both AC- and DC-conductivities. The latter becomes saturated after 50 min or more due to polarization of the mobile Ag+ or Li+ ions at around the cathode