日本金属学会誌

J. Japan Inst. Metals, Vol. 52, No. 11 (1988),
pp. 1098-1102

Density and Surface Tension of Melts in the Systems CaF2-MO(M: Mg, Ca, Ba)

Shigeta Hara1 and Kazumi Ogino1

1Department of Materials Science and Processing, Osaka University, Suita

Abstract:

Densities and surface tensions of CaF2-MO(M: Mg, Ca, Ba) binary melts were measured by the Archimedean method and the maximum bubble pressure method, respectively. The results obtained were as follows:
(1)  Molar volumes of the melts in the binary systems CaF2-MO satisfied the additive rule on volume. From the results obtained, the densities of the hypothetical melts of MgO, CaO and BaO at 1827 K were estimated to be 2.64×103, 2.66×103 and 4.49×103 kg/m3, respectively.
(2)  On the basis of the findings on the density and surface tension, it is suggested that the CaF2-BaO binary system should be treated as a CaF2-CaO-BaF2 ternary system.
(3)  The melts of the CaF2-MgO and CaF2-CaO systems can be treated as the regular solutions. The interaction parameters are estimated to be 22 kJ/mol for the CaF2-MgO system and 40 kJ/mol for the CaF2-CaO system.


(Received 1988/3/28)

Keywords:

density, surface tension, calcium fluoride, binary melt, magnesium oxide, calcium oxide, barium oxide


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