Abstract
The vapor composition, partial pressures of the molecular species of the vapor, and activities of the melt components in the Na2O–B2O3–SiO2 system at temperatures of 1300 and 1350 K are studied using the Knudsen effusion mass-spectrometric method. It is shown that the vapor composition depends on the concentration ratio of sodium and boron oxides in the condensed phase. When the content of boron oxide is larger than the content of sodium oxide in the condensed phase, the vapor contains NaBO2, (NaBO2)2, and B2O3 molecules. At the ratio [Na2O] : [B2O3] > 1, the gas phase contains atomic sodium. The activities obtained for NaBO2 and B2O3 indicate substantial negative deviations from an ideal behavior.
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