The Influence of Cp(L-s) on the Calculation of Phase Diagrams: The systems AlCa and CaPb

Abstract

The difference in heat capacity, Cp(L)-Cp(s), between liquid and solid influences greatly the calculation of phase diagrams. We show, that irrespective of how we represent the difference in Gibbs energy between liquid and solid, G(L-s), the results are the same: the Enthalpy of formation of the binary intermediate compounds, and the value of G(L-s) of the end components at their eutectic point is the same. We show this on the two binary systems AlCa and CaPb. In the AlCa system the Ca eutectic temperature is 300 K below its melting point. © 1992.