Abstract
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 language | English |
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Pages (from-to) | 648-657 |
Number of pages | 10 |
Journal | International Journal of Thermophysics |
Volume | 36 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2015 Apr |
Keywords
- Alkaline-earth fluorides
- BaF
- CaF
- MgF
- SrF
- Viscosity
ASJC Scopus subject areas
- Condensed Matter Physics