The phase diagram for the system Na 3 AlF 6 −AlF 3 was determined by quenching and microscopy supplemented with DTA and X‐ray powder diffraction. Primary crystallization fields for cryolite, chiolite, and aluminum fluoride are defined. Liquid containing 30 wt% AlF 3 is in peritectic equilibrium with solid cryolite and chiolite at 741°C; solid chiolite and aluminum fluoride are in equilibrium with liquid at the eutectic composition 39 wt% AlF 3 and 694°C.
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Perry A. Foster (1970) studied this question.
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