Surface tensions of molten alkali-metal halides

Yuzuru Sato, Tatsuhiko Ejima, Mikio Fukasawa, Kenji Abe

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Surface tensions of molten alkali-metal chlorides, bromides, and iodides have been measured by the capillary-rise method. The surface tension cell, made of quartz, has two different capillaries, and the melt is sealed in it under vacuum. The surface tension is determined through the height difference of menisci in the capillaries and is highly reproducible. Surface properties of molten alkali-metal halides vary systematically with the radii of the anions and cations except for the lithium ion; i.e., lithium halides show considerably lower surface energies and surface entropies. Internal pressures of lithium halides, determined through the surface energies, show very low values. Hypothetical surface energies have been calculated by taking the internal pressures of the melts into consideration and assuming no ionic interactions other than long-range Coulombic energy. It is suggested that a considerable part of the Coulombic energy of the molten halides with small cation is canceled by short-range interactions.

Original languageEnglish
Pages (from-to)1991-1996
Number of pages6
JournalJournal of physical chemistry
Issue number5
Publication statusPublished - 1990

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry


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