The standard gibbs energy of formation of CeF3 and its activity coefficient in cryolite |
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Authors: | Ernest W. Dewing Paul Desclaux |
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Affiliation: | (1) Alcan International Laboratory, P.O. Box 8400, K7L 5L9 Kingston, ON, Canada;(2) Alcan International Laboratory, P.O. Box 1250, G7S 4K8 Jonquière, PQ, Canada |
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Abstract: | Literature data are analyzed to give the activity coefficient (γCe) of Ce in dilute solution in Al as log10γCe = −11 356/T + 4.261 referred to liquid Ce as standard state. Measurements were made in the range of 977 to 1288 K of the equilibrium Al (1) + CeF3 (s) = AlF3 (s) + Ce(Al) and give, by a third-law calculation, °G o = 183 360 + 19.456T joules, and Δ fH 298 o of CeF3 = −1701 kJ mol−1. Values of the partition coefficient of Ce between Al and molten cryolite then give activity coefficients of CeF3 in solution. These activity coefficients decrease as the NaF/AlF3 ratio is raised, showing acid behavior of CeF3. It appears to dissolve mainly in the form of Na2CeF5. |
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