Are isotopic mixtures ideal?

Research output: Contribution to journalArticle

6 Citations (Scopus)


Isotopic mixtures have long been considered as textbook examples of ideal solutions. High-precision vapor pressure measurements have shown that even these very simple mixtures exhibit deviations from the ideal behavior. The small, but still significant nonideality of isotopic mixtures can be accounted for in terms of the difference in the molar volumes of isotopic molecules. Theoretical analysis demonstrates that the internal vibrations of the molecules significantly contribute to the excess Gibbs energy, and the proper consideration of the volume dependence of molecular vibrations of the component molecules is essential to the understanding of the properties of isotopic mixtures.

Original languageEnglish
Pages (from-to)11-17
Number of pages7
JournalPure and Applied Chemistry
Issue number1
Publication statusPublished - Jan 2004

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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