A Model for Sub-critical Liquid-Vapour Coexistence in Sodium

S. M. Osman, W. H. Young

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The Hamiltonian of the ions in liquid sodium is obtained from pseudopotential perturbation theory, and the free energy is evaluated using the Gibbs-Bogoliubov variational technique together with a hard sphere reference system. The free energy of the vapour is obtained by supposing it to be a monomer-dimer mixture. The two descriptions are then combined to provide a theory of coexistence. This yields satisfactory results for the various thermodynamic properties up to a few hundred degrees short of the critical temperature.

Original languageEnglish
Pages (from-to)181-194
Number of pages14
JournalPhysics and Chemistry of Liquids
Issue number3
Publication statusPublished - Dec 1 1987


  • dimers
  • hard spheres
  • Monomers
  • pseudopotential

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Materials Chemistry


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