Glass formation, molar volumes and glass transition temperatures of binary vanadate glasses

Authors: Basu A.; Lewis J.M.; O'Brien C.P.; Feller H.; Starns S.R.; Frueh J.; Feller S.A.; Affatigato M.

Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 44, Number 1, 1 February 2003 , pp. 1-4(4)

Publisher: Society of Glass Technology

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Abstract:

Vanadate glass formation in two heavy metal oxide systems is reported and in the process physical property data were obtained. These data were compared with earlier results found from alkali and alkaline earth vanadates. Glass formation limits extended over 0.00

1.50 for the alkali and alkaline earth vanadate glass systems where R is the molar ratio of metal oxide to vanadium pentoxide. In the lead system we formed glasses over this same range, 0.00

1.50 and in the bismuth case glass formation was limited to 0.04

0.40. The lead vanadate glass transition temperature (T_g) trend compares well to that of alkaline earth vanadate glasses.The bismuth vanadate trend appears to be quite different, the T_gs remain relatively constant over the glass forming range. The molar volume trends of lead, alkaline earth and lithium vanadate glasses are very similar. They are well-fit by a model using a weighted average of the molar volumes of the respective oxides. The bismuth vanadates could not be successfully modelled by the simple mixing method. This implies that bismuth undergoes a different structural evolution when compared with the other systems reported in this paper.

Document Type: Regular paper

Publication date: 2003-02-01