RELATION BETWEEN INTEGRAL AND PARTIAL PROPERTIES OF TERNARY SOLUTIONSALONG DIFFERENT COMPOSITION TRAJECTORIES

The relations between partial and integral properties of ternary solut ions along composition trajectories suggested by Kohler, Colinet and J acob, and along an arbitrary path are derived. The chemical potentials of the components are related to the slope of integral free energy by expressions involving the binary compositions generated by the inters ections of the composition trajectory with the sides of the ternary tr iangle. Only along the Kohler composition trajectory it is possible to derive the integral free energy from the variation of the chemical po tential of a single component with composition or vice versa. Along al l other paths the differential of the integral free energy is related to two chemical potentials. The Gibbs-Duhem integration proposed by Da rken for the ternary system uses the Kohler isogram. The relative meri ts of different limits for integration are discussed.