Fusion temperatures of SiO₂-P₂O₅ binary glasses

Abstract

Experimental measurements of fusion temperatures against glass composition for binary phosphosilicate glasses, as used in optical fibres, were made. The glasses were prepared in layers within a silica tube by chemical vapour deposition. Using a model based on the fraction of P-O to Si-O bonds and the known viscosity of vitreous silica and glassy P₂O₅, theoretical calculations of fusion temperatures were made and compared with experiment. Good agreement was obtained. The model was also applied to the fusion temperatures of binary SiO₂-GeO₂ and SiO₂-B₂O₃ glasses, and agreement with qualitative experimental measurement was found. Viscosity-temperature data for glasses in these three systems may also be calculated from the same model.

Physics and Chemistry of Glasses (1978) Vol.19(3) pp.41-42

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