Abstract
ABSTRACTThe interaction of Eu2O3 with molten NaBr–NaI (0.77:0.23) mixture at 973 K was studied by sequential addition method with the use of YSZ membrane oxygen electrode for controlling of course of the process. The Red-Ox process is accompanied with formation of EuO in the melt. The total solubility of EuO (sum of concentration of Eu2+, O2–, non-dissociated EuO) in the molten NaBr–NaI at 973 K (mole fraction 2.7 × 10–4) is considerably lower than in pure NaI melt (4.2 × 10–4), which can be explained using the ‘hole’ model by reduction of a number of holes of comparable with EuO particle size because of addition of smaller bromide ion to the iodide melt.The solubility of EuO is appreciably affected by its dispersity and the value of surface energy causing these solubility changes is estimated as 37 J m–2.
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