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Structure of glasses and melts in the Na2O-B2O3 system from high-temperature Raman spectroscopic data: I. Influence of temperature on the local structure of glasses and melts

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Abstract

The local structure of glasses and melts in the Na2O-B2O3 system in the composition range 10–30 mol % Na2O is investigated by high-temperature Raman spectroscopy in the temperature range 20–1150°C. The recorded spectra are analyzed by simulating the experimental spectra in the form of a superposition of the set of Gaussian lines. The results of the simulation are used to determine the concentrations of the main structural units of borates as a function of the composition and temperature. The dynamic equilibrium of the interaction between the structural units in melts has the form

$$ B_{4/2}^ - \rightleftarrows B_{2/2} O^ - $$

and shifts toward the right, i.e., toward the formation of BØ2O− metaborate triangles (where Ø is a bridging oxygen atom), with an increase in temperature. The enthalpy of the disproportionation process depends on the melt composition and increases with an increase in the oxide modifier concentration.

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  1. Institute of Mineralogy, Ural Division, Russian Academy of Sciences, Miass, Il’men Reserve, 456317, Russia

    A. A. Osipov & L. M. Osipova

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  1. A. A. Osipov
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  2. L. M. Osipova
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Original Russian Text © A.A. Osipov, L.M. Osipova, 2009, published in Fizika i Khimiya Stekla.

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Osipov, A.A., Osipova, L.M. Structure of glasses and melts in the Na2O-B2O3 system from high-temperature Raman spectroscopic data: I. Influence of temperature on the local structure of glasses and melts. Glass Phys Chem 35, 121–131 (2009). https://doi.org/10.1134/S1087659609020011

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  • DOI: https://doi.org/10.1134/S1087659609020011

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