The glass transitions, softening points, devitrification, and melting have been determined by differential scanning calorimetry for the ternary system water-sucrose-sodium chloride over the accessible composition range. X-ray diffraction was used to identify the devitrification in freeze-dried samples. Devitrification is due to NaCl crystallization from the wholly amorphous mixtures and of sucrose or the ternary compound sucrose. NaCl . 2H(2)O in the crystalline freeze-dried mixtures. The part of the solid/liquid state diagram with glass transitions and softening temperature surfaces and the line of the "maximally" freeze-concentrated solutions are represented as projections on the composition triangle.