Sodium Fluoride Solubility and Crystallization in Photo-Thermo-Refractive Glass

    Authors

    V. M. Fokin; G. P. Souza; E. D. Zanotto; J. Lumeau; L. Glebova;L. B. Glebov

    Comments

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    Abbreviated Journal Title

    J. Am. Ceram. Soc.

    Keywords

    Materials Science, Ceramics

    Abstract

    Photo-thermo-refractive (PTR) glass undergoes a refractive index change after UV exposure followed by heat treatment for nanocrystallization of NaF, allowing phase holograms to be permanently recorded in the glass. PTR glass was invented 60 years ago, and optical elements based on PTR glass have been produced for the past decade, but its detailed crystallization mechanism is largely unknown. Since solubility and composition of the parent glass determine the supersaturation and hence the thermodynamic driving force for crystallization, the present paper was aimed at measuring the solubility of NaF in PTR glass via estimating the equilibrium volume fraction of crystallized NaF as a function of temperature. The temperature above which all NaF originally contained in the parent glass remains dissolved in the melt, and that below which all NaF could crystallize, were also estimated. Redesigning of thermal processing parameters and composition of PTR glass, aiming at the improvement of optical elements based on this glass, can be performed in light of the results achieved.

    Journal Title

    Journal of the American Ceramic Society

    Volume

    93

    Issue/Number

    3

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    716

    Last Page

    721

    WOS Identifier

    WOS:000274950900024

    ISSN

    0002-7820

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