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The standard gibbs energy of formation of CeF3 and its activity coefficient in cryolite

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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 o298 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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Authors and Affiliations

  1. Alcan International Laboratory, P.O. Box 8400, K7L 5L9, Kingston, ON, Canada

    Ernest W. Dewing (Principal Scientist)

  2. Alcan International Laboratory, P.O. Box 1250, G7S 4K8, Jonquière, PQ, Canada

    Paul Desclaux (Consultant)

Authors
  1. Ernest W. Dewing
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  2. Paul Desclaux
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Dewing, E.W., Desclaux, P. The standard gibbs energy of formation of CeF3 and its activity coefficient in cryolite. Metall Trans B 21, 861–865 (1990). https://doi.org/10.1007/BF02657811

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