Effects of Substituting B2O3 for P2O5 on the Structures and Properties of V2O5-P2O5 Glass Systems (II)

摘要

In this study, we verify the relationship among the catalytic effect, electrical conductivity, and structure of vanadium borophosphate glasses that have a coincidence of BO3, and BO4 and a coincidence of V4+ and V5+. We prepared vanadium borophosphate glasses with various compositions, given by 70V(2)O(5)-xB(2)O(3)-(70-x) P2O5(x=0-10mol%), and analyzed the catalytic effect, electrical conductivity, FT-IR spectroscopy, X-ray photoelectron spectroscopy, thermal properties, density, and molar volume. In V2O5-P2O5 binary glasses, the electrical conductivity increased from 0. 4073 x 10(-7)/Omega to 20.167 x 10(-7)/Omega but the catalytic effect for oxidation reactions of linoleic and stearic acid decreased with an increasing B2O3. From these results, we can deduce that electrons shift from V4+ to V5+ with an increasing B2O3. FT-IR analysis showed an occurrence peak at 680 cm(-1) and XPS analysis showed that a V4+ decrease and a V5+ increase are the basis of the electron shift from V4+ to V5+. We also verify the structure and change in properties from quantitative properties such as thermal properties, density, and molar volume.