Simulation of Phase Complex of Stable Pentatope LiF–K₂CrO₄–Rb₂CrO₄–KF–RbF of the Four-Component Reciprocal System Li⁺,K⁺,Rb⁺||F^–,\({\text{CrO}}_{4}^{{2 - }}\)

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发表日期：

2024年6月1日

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A. V. Burchakov,
E. O. Burchakova

摘要

Abstract

The quasi-four-component system LiF–K₂CrO₄–Rb₂CrO₄–KF–RbF, which is a stable pentatope of the four-component reciprocal system Li⁺,K⁺,Rb⁺||F^–, \({\text{CrO}}_{4}^{{2 - }}\) , has been selected for study. The non-invariant and monovariant equilibria in the system have been predicted using the crystallization scheme: the eutectic equilibrium L ⇄ LiF + K_xRb_{1 –} _xF + α-K_2xRb_{2 – 2x}CrO₄ + α-K_3xRb_{3 – 3x}FCrO₄ is realized in the system, which is confirmed by differential thermal analysis. The crystallization scheme makes it possible to predict non- and monovariant equilibria based on the analysis of faceting systems. The composition and melting point of the mixture corresponding to the four-component eutectic E^□ 438 have been revealed. Based on the data obtained, a 3D computer model of the phase complex of the system in the form of a concentration pentatope is constructed. The computer model clearly demonstrates the phase transformations in the system. The structure of the spatial phase diagram is revealed. In the system, the crystallizing phases are lithium fluoride, three phases of continuous series of solid solutions, namely, based on potassium and rubidium fluorides K_xRb_{1 –} _xF, based on potassium and rubidium chromates in α-polymorphic modification α-K_2xRb_{2 – 2x}CrO₄, and based on potassium and rubidium fluoride chromates in α-polymorphic modification α-K_3xRb_{3 – 3x}FCrO_4.

Simulation of Phase Complex of Stable Pentatope LiF–K2CrO4–Rb2CrO4–KF–RbF of the Four-Component Reciprocal System Li+,K+,Rb+||F–,\({\text{CrO}}_{4}^{{2 - }}\)

摘要

Simulation of Phase Complex of Stable Pentatope LiF–K₂CrO₄–Rb₂CrO₄–KF–RbF of the Four-Component Reciprocal System Li⁺,K⁺,Rb⁺||F^–,\({\text{CrO}}_{4}^{{2 - }}\)