Phase Complex and Chemical Interaction in the Ternary Reciprocal System Li+,Rb+||Br

• Published in: Inorganic materials Vol. 58; no. 11; pp. 1179 - 1190
• Main Authors: Kharchenko, A. V., Egorova, E. M., Garkushin, I. K., Burchakov, A. V., Yakovlev, V. M., Novikov, V. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2022; Springer Nature B.V
• Subjects: Adequacy; Apexes; Bromides; Chemistry; Chemistry and Materials Science; Chromates; Differential thermal analysis; Electrochemical cells; Electrolytic cells; Eutectic composition; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Linear phase; Liquidus; Lithium; Materials Science; Melting points; Phase equilibria; Rubidium; Three dimensional models; fusible electrolytes for electrochemical cells; conversion point; isothermal and polythermal sections; phase tree; modeling of phase equilibria; metathesis; 3D model
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168522110085

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The phase complex of a ternary reciprocal system of lithium and rubidium bromides and chromates has been studied theoretically and experimentally for the first time. We have divided the phase complex into secondary phase compatibility triangles and obtained a linear phase tree, in which the vertices of each simplex describe crystallizing phases. Using the ion balance method, we have described chemical transformations and predicted crystallizing phases for mixtures with a preset composition. Using data for the bounding systems, we have constructed a computer 3D model of the phase complex and obtained polythermal and isothermal sections and liquidus surface isotherms. Using differential thermal analysis and X-ray diffraction, we have demonstrated adequacy of the proposed division into simplexes. Phase equilibria in the system have been studied experimentally, and we have determined the composition and melting point of ternary invariant points. The composition of the ternary eutectic
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245 is recommended for use as a fusible electrolyte for electrochemical cells. Comparison of experimental data with prediction results derived from the model demonstrates adequacy of modeling of phase equilibria with the use of a 3D model.