Effect of substituting B2O3 for P2O5 in conductive vanadate glass

Abstract

In this study, we verified the relationship among the electrical conductivity, chemical durability, and structure of conductive vanadate glass in which BO3 and BO4 and V4+ and V5+ coexist simultaneously. We prepared samples of vanadium borophosphate glass with various compositions, given by 50V2O5-xB2O3-(50-x)P2O5 (x = 0 ∼ 20 mol%) and 70V2O5-xB2O3-(70-x)P2O5 (x = 0 sim; 10 mol%), and analyzed the electrical conductivity, chemical durability, FT-IR spectroscopy, thermal properties, density, and molar volume. Substituting B2O3 for P2O5 was found to improve the electrical conductivity, chemical durability, and thermal properties. From these results, we can draw the following conclusions. First, the electrons shift from the electron rich V4+ to the electron deficient BO3 as the B2O3 content increases. Second, the improvement in chemical durability and thermal properties is attributed to an increase in cross-linked structures by changing from a BO3 structure to a BO4 structure.