Stable triangle (LiF)2–(KI)2–Li2CrO4 of the quaternary reciprocal system Li,K∥F,I,CrO4

The quaternary reciprocal system Li,K||F,I,CrO 4 was partitioned into stable simplexes using graph theory. The system consists of five stable tetrahedra separated by four stable triangles. The chemical interaction between components was described based on the material balance written with account for occurring chemical reactions. Phase equilibria in the quasi-ternary system (LiF) 2 –(KI) 2 –Li 2 CrO 4 were studied for the first time; in this system, the temperature and composition of a ternary eutectic were determined. The limited solubility of two liquid phases manifests itself in the concentration region adjacent to the LiF–KI quasibinary system. A three-dimensional model of the phase complex of the system was constructed in temperature– concentration coordinates.