Density and Surface Tension of CaF2-based Binary Melts
Kazumi OGINO, Hideharu SHIBAIKE, Shigeta HARA
Densities and surface tensions of CaF2-(MgF2, BaF2, SrF2, NaF, LiF, CaO) binary melts were measured by the Archimedean method and the maximum bubble pressure method, respectively. The results obtained were summarized as follows:
(1) The molar volumes of binary melts were calculated from their densities at 1550°C. For all of measured systems except molten CaF2-MgF2 system, volume changes of mixing were not observed, while for molten CaF2-MgF2 system negative volume change was observed slightly.
(2) The surface tensions of molten CaF2-SrF2 system at 1 550°C were explained on the basis of the equation for the surface tension of ideal solution proposed by Guggenheim, while those of the other systems were explained on the basis of the equation for the surface tension of regular solution proposed by Guggenheim.
(3) From the relation between surface tension and molar volume of CaF2-based binary melts, it was supposed that the surface tensions of those melts were dependent on the packing of fluorine ions on surface layer of melts.
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Tetsu-to-Hagané Vol.65(1979), No.1