3D model of a stable triangle LiF–NaBr–KBr four-component reciprocal system Li+, Na+, K+ || F-, Вr-

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A 3D model of the phase equilibrium states of the quasi-three-component system LiF–NaBr–KBr, which is a stable triangle of the four-component reciprocal system Li+, Na+, K+ || F-, Br-, has been constructed. Based on the 3D-model, polythermal, isothermal sections and the polytherm of phase crystallization were constructed for the first time. Two polythermal sections contain wide areas of boundary solid solutions based on sodium and potassium bromide. In an isothermal section at 650 оC, the fields of the liquid phase and the coexisting two and three phases are delimited. The crystallization polytherm is represented by three fields. In the crystallization field of lithium fluoride, the area of separation of two liquids is limited. The direction of the ion exchange reaction 2LiBr + NaF + KF = 2LiF + NaBr + KBr was confirmed by thermodynamic calculations at temperatures of 400, 600, 800, 1000K. The exothermic nature of the exchange reaction is confirmed by taking a DTA heating curve for a mixture of powders from 50% LiBr + 25% NaF + 25% KF, and the phase composition of the reaction products LiF + NaBr(OTR) + KBr(OTR) is confirmed by X-ray phase analysis data, where OTR is limited solid solution.

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作者简介

A. Burchakov

Samara State Technical University

Email: dvoryanova_kat@mail.ru
俄罗斯联邦, Samara

I. Garkushin

Samara State Technical University

Email: dvoryanova_kat@mail.ru
俄罗斯联邦, Samara

E. Dvoryanova

Samara State Technical University

编辑信件的主要联系方式.
Email: dvoryanova_kat@mail.ru
俄罗斯联邦, Samara

U. Emelyanova

Samara State Technical University

Email: dvoryanova_kat@mail.ru
俄罗斯联邦, Samara

A. Finogenov

Samara State Technical University

Email: dvoryanova_kat@mail.ru
俄罗斯联邦, Samara

参考

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2. Fig. 1. Scan of the face elements of the system Li+, Na+, K+ || F-, Vg- [ ].

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3. Fig. 2. The prism of the compositions of the system Li+, Na+, K+ || F-, Vg- [ ].

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4. Fig. 3. 3D model of the quasi-linear LiF–NaBr–KBr system: a) the phase complex of the system; b) a detachable model of the phase complex.

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5. Fig. 4. T-x is a QT section diagram of the quasi–linear LiF–NaBr-KBr system constructed from a 3D model.

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6. Fig. 5. T-x is a K1K2 section diagram of the quasi–linear LiF–NaBr-KBr system constructed from a 3D model.

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7. Fig. 6. Isothermal section at a temperature of 650 ° C of the quasi–linear LiF–NaBr-KBr system constructed from a 3D model.

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8. Fig. 7. Polytherm of crystallization of the quasi–linear LiF–NaBr-KBr system constructed from a 3D model.

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9. Figure 8. The location of mixture 1 on the K1–K2 conversion line in the unstable triangle NaF–KF–LiBr.

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10. Fig. 9. Derivatogram of heating a mixture of powders 50٪ LiBr + 25% NaF + 25% KF.

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11. Fig. 10. Derivatogram of cooling the melt of a mixture of powders 50٪ LiBr + 25% NaF + 25% KF.

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12. 11. X-ray image of a sample of the composition 50% LiBr + 25% NaF + 25% KF (KBr PDF 01-072-1541; NaBr PDF 01-078-0761; LiF PDF 01-071-3743).

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13. Fig. 12. The crystallization scheme of mixture 1 on the conversion line K1–K2 in a stable triangle LiF–NaBr–KBr.

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