Abstract
Surface tension and density of molten CaF2-based binary system were measured. From the measurement, the following results were obtained.(1) Molar volumes of the melts in the systems CaF2-NaF, and CaF2-BaF2 are deviated positively from the additive rule, while for CaF2-LiF and CaF2-MgF2 melts negative deviation from the additive rule on volume is found, but CaF2-SrF2 melt behaves ideally on volume.(2) Surface tensions of the melts in the binary systems can be expressed by Guggenheim's equation for regular solution, if a suitable interaction energy ω of each binary system is selected.(3) The interaction energy ω, estimated from surface tension of binary fluoride systems, is related to the excess volume on mixing for CaF2-MxF2 equi-molar composition (x=1 for divalent and x=2 for monovalent fluoride).(4) Liquidus lines for the systems, calculated from the interaction energy ω in combination with the thermochemical data are fairly in good agreement with those reported, but that for CaF2-NaF system is exceptional.(5) Surface tensions of binary fluoride melts are strongly depended on packing density of fluorine ions on the surface.
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