Abstract
The dissolution of air, N2, and O2 bubbles in molten B2O3 was measured by injecting the gases directly into the melt at 550°C and recording changes in bubble size with time. The shrinkage of air and N2 bubbles followed a relatively simple equation for bubble dissolution, from which the diffusion coefficient of N2 in molten B2O3 was calculated. Oxygen had a lower diffusion coefficient but a higher solubility than N2; the rapid diffusion of O2 from O2 bubbles was accompanied by absorption of N2 from the melt, which subsequently diffused from the bubble. Evidence for a strong decrease of O2 solubility in B2O3 with increase of temperature was found, which, together with the high solubility, indicated strong chemical interaction of O2 with molten B203.
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