Chou Kuo-Chih

Integration model predicting ternary thernodynamic properties from binary ones

Abstract A new solution model named integration Model has been developed for predicting the ternary thermodynamic properties from its binary ones. This model is more reasonable for its full utilization of binary information. Binary thermodynamic properties are fitted by means of rational function method and ternary partial thermodynamic properties are calculated using R-function method. Integration model was applied to the Na-Hg-Pb system and a good accordance was obtained between the calculated and experimental values.

Calculation of activities from the phase diagram involving two liquid or solid coexisting phases

Abstract The formulae for calculating activities and activity coefficients from the phase diagram involving a two liquid or solid coexisting phases have been presented, in which no extra thermodynamic properties are required except for the composition of components along a miscibility gap. The application of these equations to the Zn-Pb and Zn-Bi systems shows that the calculation results are close to the experimental measurements.

A new treatment for calculating activities from phase diagrams involving two liquid or solid coexisting phases

Abstract New formulae for calculating activities and activity coefficients from phase diagram at a fixed temperature are presented for a binary system involving a two liquid or solid coexisting phases. In the new formulae. Richardsons assumption that for many systems Δ H i Δ S E i is approximately equal to 3000, has been adopted. In terms of the new formulae, activities of components in Zn-Pb and Zn-Bi binary systems are calculated and the results show that the formulae are efficient.

Estimation of stability from phase diagram

Abstract The relation between the Darkens excess stability and phase diagram has been revealed and the behavior of the excess stability curve over the entire composition range has been described quantitatively in terms of the formulae presented in this paper based on the knowledge of phase diagram. In order to judge if a positive peak will appear in the stability curve at the composition corresponding to an intermediate compound, a criterion inequality has been suggested. All of them have been successfully applied to alloys and slag systems.