Abstract
Quantitatively satisfactory fits are obtained for the liquidus lines of the congruently-melting, “line-compounds”, InSb, GaSb, InAs, and GaAs using a recently derived basic liquidus equation. In addition the fits are consistent with 1) the relations imposed by a zero Gibbs free energy change on congruent melting and 2), except for GaAs, the experimental, compound-V element, eutectic temperature. The successful liquid phase model is a simple one in which the enthalpy and excess entropy of mixing are cubic functions of the atomic fraction. With all parameters fixed by these fits, other high temperature properties are calculated and agree satisfactorily with experiment. All fits are shown in tabular form. They appear so good that it seems likely the model will prove adequate for all the III–V systems. A small temperature dependence, consistent with the presently incomplete data, can be incorporated into the enthalpy and excess entropy without adversely affecting the fits obtained. On the other hand, extensive calculation and comparison with experiment conclusively shows that the two-parameter, quasiregular, or simple solution model does not give a satisfactory overall fit.
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Brebrick, R.F. Quantitative fits to the liquidus line and high temperature thermodynamic data for InSb, GaSb, InAs, and GaAs. Metall Trans A 8, 403–415 (1977). https://doi.org/10.1007/BF02661749
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DOI: https://doi.org/10.1007/BF02661749