A mixture of charged hard spheres (restricted primitive model) with an attractive Yukawa tail added to represent van der Waals forces between the ions is considered as a model of molten salts. The location of the critical point of the gas–liquid phase transition is followed as a function of the strength A of the attractive term. It is found that the critical density increases with increasing A, but that a quantitative agreement between the theoretical results and the available experimental estimates of the critical constants for alkali halides requires the use of an effective dielectric constant greater than unity.
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See, however, Ref. 6(a) for a discussion on the accuracy of this approximation as applied to the restricted primitive model. Reference 6(b) discusses corrections to these results due to ionic association, which is not adequately described by the MSA.
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© 1985 American Institute of Physics.
1985
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