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Activities in NaF-AlF3 melts saturated with Al2O3

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Abstract

The electromotive force of the concentration cell

has been determined at 1000°C for molar ratios NaF/AlF3 on the right-hand side 4.0 to 0.46. On the assumption of unit transport number of Na+, relative activities of NaF and A1F3 are derived. Absolute values at a molar ratio of 2.48 were established by measuring the sodium content of aluminum in equilibrium with the melt. At a molar ratio of 3, –NaF = 0.31 andaAlF3 = 0.00058. At molar ratios below 0.65, where the melts are saturated with AlF3, the calculated value ofaAlF3 is 0.81 instead of 1. Possible reasons for the discrepancy are discussed.

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Authors and Affiliations

  1. Nippon Light Metal Research Laboratory Ltd., Kambara, Shizuoka, Japan

    K. Yoshida

  2. Aluminum Company of Canada, Ltd., Research Laboratory, Arvida, Quebec, Canada

    E. W. Dewing

Authors
  1. K. Yoshida
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  2. E. W. Dewing
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Yoshida, K., Dewing, E.W. Activities in NaF-AlF3 melts saturated with Al2O3 . Metall Trans 3, 683–686 (1972). https://doi.org/10.1007/BF02642751

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  • DOI: https://doi.org/10.1007/BF02642751

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