Viscosity of Molten Alkaline-Earth Fluorides

Osamu Takeda, Yosuke Hoshino, Yusuke Anbo, Kei ichi Yanagase, Masahiro Aono, Yuzuru Sato

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The viscosities of molten alkaline-earth fluorides MgF2, CaF2, SrF2 BaF2 were measured using the oscillating crucible method, which is especially suitable for measuring molten salts with low viscosity. The results showed a good Arrhenius linearity over a wide temperature range. The measured viscosities and activation energies increased in the following order: MgF2 < CaF2 < BaF2 < SrF2. Judging by the charge density, the viscosity of alkaline-earth fluorides should increase from molten BaF2 to MgF2. However, the results indicate a different tendency, which may be explained by a Coulomb force that is very strong. The low viscosity of MgF2 can be attributed to a decreased cohesive force, due to a partial loss of the Coulomb force caused by a higher charge density of the material. The viscosities were also compared to those of molten alkali fluorides and alkaline-earth chlorides. The viscosities of molten alkaline-earth fluorides were higher than those of molten alkali fluorides and alkaline-earth chlorides. The CaF2 viscosity determined in this study was compared to literature values and showed a reasonable value in the relatively low-viscosity region.

Original languageEnglish
Pages (from-to)648-657
Number of pages10
JournalInternational Journal of Thermophysics
Issue number4
Publication statusPublished - 2015 Apr


  • Alkaline-earth fluorides
  • BaF
  • CaF
  • MgF
  • SrF
  • Viscosity

ASJC Scopus subject areas

  • Condensed Matter Physics


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