
TY  - JOUR
A1  - Esdaile, JD 
T1  - A model describing the variation in free energy in compound and single phase regions in binary systems containing miscibility gaps
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1965
VL  - 18
IS  - 12
SP  - 1897
EP  - 1910
KW  - 
UR  - https://doi.org/10.1071/CH9651897 
N2  - A model is derived to represent the variation of free energy of combination of one gram-atom of two components, represented by A and B, in intermediate single, or compound, phases in a binary system as a function of composition at constant temperature, and with a minimum of experimental data. The derivation of the model involves the, assumption that the straight lines representing the free energy of the two phase fields adjacent to a compound phase, on an isothermal integral free energy against atomic fraction diagram, intersect at the mid-point of the compound phase. A relation between logaA, logaB, and the atomic fraction NB is developed so as to conform with the preceding requirement and yield an almost horizontal tangent to the curve representing the compound phase at NB = ½ for a hypothetical symmetrical isothermal diagram. The equations developed on these bases are extended to non-symmetrical systems. These are shown to be successful in predicting the variation in free energy of compound phases, as a function of composition, in binary systems for which experimental data are available. 
ER  -

