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A model investigation of the process of phase formation in photochromic glasses

Part 1 Solubility of AgCl in sodium borate melts and experimental results on the kinetics of phase formation

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Abstract

The formation of the AgCl phase in technical photochromic glasses is investigated using a model sodium borate glass. The temperature dependence of the solubility of AgCl in the melt is established and the solubility data are interpreted by a simple variant of the theory of regular solutions and thus the thermodynamic driving force of the process is determined. The kinetics of nucleation, growth and overall phase formation are followed by X-ray methods, electron microscopy and nephelometry. The formation of the AgCl-phase in the model melt can be described as a process of binodal liquid phase separation. The initial stages of this process display the characteristic features of non-steady state nucleation. In the advanced stages of AgCl formation saturation regions in Ostwald ripening curves are observed which cannot be explained by the theory of Lifshitz-Slyozov developed for a Newtonian fluid while glass forming systems behave near Tg as viscoelastic systems. The general validity of the results obtained for the present system is discussed and analogies with AgCl segregation in other photochromic glasses is discussed. The quantitative description of Ostwald ripening in viscoelastic media is attempted in a following contribution.

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Authors and Affiliations

  1. Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia, 1040, Bulgaria

    R. Pascova, I. Gutzow & I. Tomov

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  1. R. Pascova
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  2. I. Gutzow
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  3. I. Tomov
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Pascova, R., Gutzow, I. & Tomov, I. A model investigation of the process of phase formation in photochromic glasses. J Mater Sci 25, 914–920 (1990). https://doi.org/10.1007/BF03372179

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