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A two-sublattice model for molten solutions with different tendency for ionization

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Abstract

Different models accounting for the introduction of an excess of cations or anions in an ionic melt are considered. A new model which describes the variation in the thermodynamic properties in a melt as it gradually changes its composition from purely metallic state to complete ionization is developed. The model is based upon Temkin’s expression for the configurational entropy of mixing. Neutral species and hypothetical vacancies with an induced charge are introduced on the anion sublattice. The induced charge is equal to the average valency of the species occupying the cation sublattice. When the tendency of ionization is weak, the model approaches the substitutional model. For binary systems the new model is formally identical to the associate solution model if the associates are defined in such a way that they contain one atom of the electronegative element. For higher-order systems the new model works with a lower number of composition variables and parameters than the associate solution model.

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Authors and Affiliations

  1. Physical Metallurgy, USA

    Mats Hillert (Professor)

  2. Division of Physical Metallurgy, Royal Institute of Technology, S-100 44, Stockholm, Sweden

    Bo Jansson (Research Associates), Bo Sundman (Research Associates) & John ågren (Research Associates)

Authors
  1. Mats Hillert
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  2. Bo Jansson
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  3. Bo Sundman
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  4. John ågren
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Hillert, M., Jansson, B., Sundman, B. et al. A two-sublattice model for molten solutions with different tendency for ionization. Metall Trans A 16, 261–266 (1985). https://doi.org/10.1007/BF02816052

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