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The dissolution of air, N 2 , and O 2 bubbles in molten B 2 O 3 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 N 2 bubbles followed a relatively simple equation for bubble dissolution, from which the diffusion coefficient of N 2 in molten B 2 O 3 was calculated. Oxygen had a lower diffusion coefficient but a higher solubility than N 2 ; the rapid diffusion of O 2 from O 2 bubbles was accompanied by absorption of N 2 from the melt, which subsequently diffused from the bubble. Evidence for a strong decrease of O 2 solubility in B 2 O 3 with increase of temperature was found, which, together with the high solubility, indicated strong chemical interaction of O 2 with molten B 2 0 3 .
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Brown et al. (1976) studied this question.
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