New tungstate fluorophosphate glasses

A new class of tungstate fluorophosphate glasses was identified in the NaPO3–BaF2–WO3 ternary system. The variation of several physical properties was determined with respect to chemical composition. Characteristic temperatures, density and refractive index increase as tungsten oxide content increas...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2005-02, Vol.351 (4), p.293-298
Main Authors: Poirier, Gaël, Poulain, Marcel, Messaddeq, Younes, L Ribeiro, Sidney J.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
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Summary:A new class of tungstate fluorophosphate glasses was identified in the NaPO3–BaF2–WO3 ternary system. The variation of several physical properties was determined with respect to chemical composition. Characteristic temperatures, density and refractive index increase as tungsten oxide content increases. The optical transmission range and specially the energy bandgap depend of the WO3 amount. No crystallization could be observed for the most WO3 concentrated vitreous samples (⩾20% molar). Color and optical properties of the glasses depend of the melting time because of the presence of reduced tungsten species like W5+ and W4+. In addition, photodarkening is observed in tungsten rich glass samples under UV laser illumination and this phenomenon can be reversible by heat treatment near the glass transition temperature.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2004.11.017