Abstract
The influence of vanadium oxides as catalysts for nucleation and crystal growth in CaO-MgO-Al2O3-SiO2 glasses has been investigated. The effect of varying the total vanadium content and the ratio of oxidised to reduced vanadium ions has been observed. No internal nucleation was observed, but the rate of growth of crystals of anorthite and wollastonite from the surface was increased by additions of V2O5 and V2O3. The values of the growth rates and the analysed V5+ content in both oxidised and reduced glasses suggest that V5+ ions are the most active species. Increasing concentrations of V2O5 in the glass gave maxima in the growth rates between 2 and 4 wt % for crystallisation temperatures between 900 and 980° C.
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