The dc conductivities (u) of PbO-PzOs-VzOs glasses contain-ing up to 80 mol% VzOs were measured at T = 100°C to T = 10°C below the glass transition temperature. Dielectric constants at 1 MHz, densities, and the fraction of reduced V ion were measured at room temperature. The conduction mechanism of glasses containing >10 mol% VzOs was considered to be small-polaron hopping, as previously reported for other vanadate glasses. The temperature dependence of u was exponential, with u = ( a o / T ) exp(-W/kT). When the VzOs content was 250 mol%, W decreased and u increased with increasing Vz05 content, and the adiabatic approximation could be applied. In the composition range between 10 and 50 mol% VzOs, u increased with increasing VzOs content, but W varied little. In this region, the hopping conduction was characterized as nonadiabatic. The effect of dielectric constants and V ion spacing on W is discussed.

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P2O5 ‐ V2O5 Glasses.