Viscosity of fluorine-doped silica glasses

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Date
2018
Volume
8
Issue
9
Journal
Optical Materials Express
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Publisher
Washington D.C. : Optical Society of America
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Abstract

The viscous behavior of fluorine-doped synthetic silica is studied using collapsing experiments with different fluorine-doped tubes on a modified chemical vapor deposition (MCVD) lathe. The principles, techniques, and evaluations of this method are the same as the ones demonstrated previously in detail with pure and doped silica. The present investigations provide information about the influence of fluorine doping up to a concentration of about 10 mol% F (3.4 wt% F) in a temperature range between 1600°C and 2000°C. Fluorine doping leads to a systematic decrease in the viscosity, combined with a decrease of the activation energy of the viscous flow and a certain increase of the pre-exponential factor. In summary, this demonstrates the weakening influence of fluorine on the glass network, similar to the incorporation of hydroxyl or chlorine.

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Kirchhof, J., Unger, S., & Dellith, J. (2018). Viscosity of fluorine-doped silica glasses (Washington D.C. : Optical Society of America). Washington D.C. : Optical Society of America. https://doi.org//10.1364/OME.8.002559
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OSA Open Access Publishing Agreement