Abstract
The solubility of CeO2 in cryolite has been investigated as a function of oxygen pressure, alumina content of the melt, and A1F3 content of the melt. Additional information comes from cryoscopic measurements, cyclic voltammetric studies, and thermodynamic calculations. The conclusions are that (a) cerium in solution is exclusively Ce(III), (b) the dominant species are CeOF and CeF3, the latter probably complexed as Na2CeF5, (c) control of oxygen pressure is of importance in measuring the solubility of the oxide of any metal that has more than one oxidation state, but (d) there may be serious kinetic difficulties in equilibrating gas and molten salt.
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