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 BO2O− metaborate triangles (where O 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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