Abstract
AbstractIn a binary system, if the liquidus has been measured, if the thermodynamic properties of the liquid phase are known, and if the entropy of the solid phase is known or may be assumed to be ideal, then an exact thermodynamic calculation of the solidus as well as of the enthalpy of the solid can be made. The equations are derived and sample calculations are made for several systems. General relationships between binary phase diagrams and the thermodynamic properties of the phases are then developed. It is shown that a knowledge of any four of the following six quantities is sufficient to permit the other two to be calculated exactly: the solidus, the liquidus, enthalpy of the liquid, entropy of the liquid, enthalpy of the solid, entropy of the solid.
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