Structural and colour changes induced by increasing amounts of vanadium oxide, V2O5, are presented for a new formulation of glass with composition 37CaO. 6ZrO2.57SiO2 (mol%). Property changes were evaluated by measuring density, chemical durability and microhardness of glasses with increasing amount of vanadium oxide. Vanadium oxide imparts to the glass a light green colour, not dissimilar to that from chromium, at low content, while at higher concentration the colour changes to dark brown. Spectroscopic technique, VIS-NIR and ESR were used to identify the chromophore centres in terms of vanadium oxidation state and coordination which were subsequently correlated to property changes. Experimental evidence is reported for an equilibrium between two species, V5+ tetrahedral and V4+ tetragonally distorted octahedral.
Vanadium doping in CaO-ZrO2-SiO2 glasses / C. Siligardi, A. Ferrari, C. Leonelli, S. Bruni. - In: PHYSICS AND CHEMISTRY OF GLASSES. - ISSN 0031-9090. - 43:2(2002), pp. 97-101.
Vanadium doping in CaO-ZrO2-SiO2 glasses
S. BruniUltimo
2002
Abstract
Structural and colour changes induced by increasing amounts of vanadium oxide, V2O5, are presented for a new formulation of glass with composition 37CaO. 6ZrO2.57SiO2 (mol%). Property changes were evaluated by measuring density, chemical durability and microhardness of glasses with increasing amount of vanadium oxide. Vanadium oxide imparts to the glass a light green colour, not dissimilar to that from chromium, at low content, while at higher concentration the colour changes to dark brown. Spectroscopic technique, VIS-NIR and ESR were used to identify the chromophore centres in terms of vanadium oxidation state and coordination which were subsequently correlated to property changes. Experimental evidence is reported for an equilibrium between two species, V5+ tetrahedral and V4+ tetragonally distorted octahedral.
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