Phase Tree, Analysis of Crystallizing Phases, and Description of Chemical Interaction in the Ca,Ba||F,Cl Three-Component Reciprocal System

Abstract—The paper analyzes the phases crystallizing in the Ca,Ba||F,Cl, ternary reciprocal system and describes ion-exchange and complexation reactions therein. The system is partitioned into simplexes using graph theory. A phase tree of the system has been designed, on the basis of which the number and compositions of phases crystallizing in stable elements have been predicted. A 3D model of the phase assemblage of the Ca,Ba||F,Cl system has been designed in the KOMPAS 3D v21 software. The presence of a quasi-binary eutectic and the stability of the crystallizing phases (CaF₂ and BaCl₂) on the CaF₂–BaCl₂ stable diagonal were confirmed by thermogravimetry (TG) and X-ray powder diffraction (XRD).