Abstract
The dissolution kinetics of pure and pure powders, respectively, into , were each measured and compared with those for the same oxides during simultaneous dissolution of the mixed oxide powders in the same environment. For dissolution of mixed oxides, accelerated kinetics for each oxide resulted from an acid‐base coupling reaction. Measurements of the changes in the and oxygen activities in the melt during oxide dissolution suggest that the dissolution reaction for the single oxides is controlled by the diffusion of (as ). Therefore, the enhanced dissolution kinetics for mixed oxides is interpreted in terms of a synergistic reaction to promote this diffusion step.
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