Russian Journal of Inorganic Chemistry

, Volume 64, Issue 7, pp 894–898 | Cite as

Invariant Equilibria in Multicomponent Systems

  • L. SolievEmail author


The translation method for predicting and constructing equilibrium phase diagrams of multicomponent systems is developed based on the compatibility of structural elements of partial constituent (n-component) systems and the general (n + 1)-component system with account for the requirements of the Gibbs phase rule. The invariant equilibrium states in the five-component system NaClKClMgCl2CaCl2H2O at 25°C are studied. This multicomponent system features the options of invariant equilibria where one and the same composition of equilibrium solid phases can be in equilibrium with saturated solutions of differing concentrations. Therefore, this invariant equilibrium is to be reflected in the diagram as a geometric (invariant) image that has a dimension (it may be conventionally referred to as a quasi-point) and not by a point. The dimension of this image is determined by the concentration bounds of components in the equilibrium saturated solution.


geometric images solubility diagram phase complex 



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© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Aini Tajik State Pedagogical UniversityDushanbeRepublic of Tajikistan

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