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Phase Tree of the Quinary Reciprocal System Li+,K+||F,Cl,Br,\({\text{CrO}}_{4}^{{2 - }}\) and Investigation of the LiF–Li2CrO4–KCl–KBr Stable Tetrahedron

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Inorganic Materials Aims and scope

Abstract—

The quinary reciprocal system Li+,K+||F,Cl,Br,\({\text{CrO}}_{4}^{{2 - }}\) has been divided into simplexes using graph theory: by making up an adjacency matrix and solving a logical expression. The results have been used to construct the phase tree of the system, which has a linear structure and consists of four stable secant tetrahedra, four stable pentatopes, and one stable hexatope. The number and composition of phases crystallizing in the system have been predicted. The LiF–KCl–KBr–Li2CrO4 stable tetrahedron has been studied using differential thermal analysis and X-ray diffraction. The tetrahedron has no invariant equilibrium points. The continuous series of solid solutions between potassium chloride and potassium bromide has been shown to be stable, without decomposition. Three solid phases have been shown to crystallize in the tetrahedron: LiF, Li2CrO4, and KClxBr1–x.

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Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education as part of the state research target for Samara State Technical University, theme no. FSSE-2023-0003.

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Correspondence to M. A. Sukharenko.

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Translated by O. Tsarev

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Egorova, A.S., Sukharenko, M.A., Kondratyuk, I.M. et al. Phase Tree of the Quinary Reciprocal System Li+,K+||F,Cl,Br,\({\text{CrO}}_{4}^{{2 - }}\) and Investigation of the LiF–Li2CrO4–KCl–KBr Stable Tetrahedron. Inorg Mater 59, 866–872 (2023). https://doi.org/10.1134/S0020168523080046

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