Abstract
The glass-forming regions in three vanadate systems were determined and some physical properties and the ratio of V4+ state to total vanadium, i.e. V4+/Vtotal, were investigated.The remarkable features of these glasses are as follows: dark and opaque in color, poor chemical durability, devitrification tendency on heating, large thermal expansion coefficient, low transformation and softening temperatures, large specific gravity, and low Vickers hardness. In the BaO-ZnO-V2O5 glass which has stable and wide glass-forming region ranging 33 to 70mol% of V2O5, the remarkable nonlinear relations between the compositions and its properties were observed. The chemical analysis of vanadium in these glasses indicated that vanadium in 5+ state was predominant and the value of V4+/Vtotal was less than 4 percent.From the contribution of N. W. M., i.e. K2O, BaO, and ZnO, to the properties of glasses, it is considered that the character of each N. W. M. in these vanadate glasses is similar to that in the silicate glasses and the coexistence of two kinds of N. W. M. is effective for the stabilization of vanadate glasses.
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