Abstract
The influence of the water content on the microinhomogeneous structure of sodium borate glasses containing 2.5 and 5.0 mol % Na2O and on the kinetics of structural relaxation in vitreous boron oxide and sodium borate glasses is studied by the small-angle X-ray scattering (SAXS) technique. It is demonstrated that an increase in the water content brings about an increase in the size of the inhomogeneity regions and a decrease in the mean square of the difference between the electron densities 〈(Δρ)2〉 for the microinhomogeneous structure. The inference is made that water has a catalytic effect on the aggregation of alkali borate structural units. The kinetic dependence of the intensity of small-angle X-ray scattering by thermal density fluctuations is described by the Kohlrausch equation. The exponent β in the Kohlrausch equation is close to 1.0 for “dry” glasses and decreases to 0.5 for glasses containing 0.7–1.0 mol % H2O.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Visser, Th.J.M. and Stevels, J.M., Influence of Water on Rheological Properties of Alkali Borate Glasses, J. Non-Cryst. Solids, 1972, vol. 7, no. 4, pp. 394–401.
Golubkov, V.V., Structural and Chemical Inhomogeneity of Single-Phase Glasses and Melts, J. Non-Cryst. Solids, 1995, vols. 192–193, pp. 463–469.
Golubkov, V.V., Structural and Chemical Inhomogeneities in Borate Glasses, in Borate Glasses, Crystals, and Melts, Wright, A.C., Feller, S.A., and Hannon, A.C., Eds., Sheffield: Soc. Glass Technol., 1997, pp. 88–98.
Golubkov, V.V., A Problem of Inhomogeneous Glass Structure, Fiz. Khim. Stekla, 1998, vol. 24, no. 3, pp. 289–304 [Glass Phys. Chem. (Engl. transl.), 1998, vol. 24, no. 3, pp. 196–207].
Golubkov, V.V. and Porai-Koshits, E.A., Thermal Expansion and Glass Transition in Borate Melts, Fiz. Khim. Stekla, 1991, vol. 17, no. 5, pp. 796–809.
Andreev, N.S., Mazurin, O.V., Porai-Koshits, E.A., Roskova, G.P., and Filipovich, V.N., Yavleniya likvatsii v steklakh (Phase Separation in Glasses), Leningrad: Nauka, 1974.
Golubkov, V.V., Titov, A.P., and Porai-Koshits, E.A., Small-Angle X-ray Setup for Investigating Glasses at High Temperatures, Prib. Tekh. Eksp., 1975, no. 1, pp. 215–217.
Golubkov, V.V. and Shakhmatkin, B.A., Specific Features of Temperature Dependences of the Intensity of Small-Angle X-ray Scattering in Oxide Systems at Liquidus Temperatures, Fiz. Khim. Stekla, 1999, vol. 25, no. 4, pp. 444–453 [Glass Phys. Chem. (Engl. transl.), 1999, vol. 25, no. 4, pp. 335–341].
Golubkov, V.V. and Shakhmatkin, B.A., Investigation of the Phase Diagram of the Na2O-B2O3-SiO2 System by the Small-Angle X-ray Scattering Technique, Fiz. Khim. Stekla, 2004, vol. 30, no. 3, pp. 281–289 [Glass Phys. Chem. (Engl. transl.), 2004, vol. 30, no. 3, pp. 209–214].
Author information
Authors and Affiliations
Additional information
Original Russian Text © V.V. Golubkov, 2006, published in Fizika i Khimiya Stekla.
Rights and permissions
About this article
Cite this article
Golubkov, V.V. Influence of water on the structure and kinetics of structural relaxation in sodium borate glasses. Glass Phys Chem 32, 391–398 (2006). https://doi.org/10.1134/S1087659606040018
Received:
Issue Date:
DOI: https://doi.org/10.1134/S1087659606040018