Abstract
We have studied phase equilibria in the quaternary system NaF–NaCl–NaBr–Na2CrO4. The results demonstrate that the continuous series of NaClxBr1 – x solid solutions persists in the system. The chemical composition and melting point (507°C) of a mixture with the composition corresponding to the quaternary minimum have been determined by differential thermal analysis, and its enthalpy of fusion (232 J/g) has been determined by differential scanning calorimetry. Its phase composition has been confirmed by X-ray diffraction. Theoretical and experimental techniques have been used to identify phase equilibria and the phase crystallization sequence and construct a 3D computer model of phase relations, which makes it possible to predict phase transformations for arbitrary representative points in the system studied.
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