Study of the NaBr–DyBr3 phase diagram by differential thermal analysis

The phase diagram of the quasi binary NaBr–DyBr3 system was determined by differential thermal analysis (DTA) applied to 27 samples covering the complete composition range of the system. The 3NaBr*DyBr3(s) compound is present in the solid-phase in addition to the pure component halides NaBr(s) and DyBr3(s). The DyBr3(s) and 3NaBr*DyBr3(s) phases showed a polymorphic transition at 1112 and at 733 K, respectively. The {DyBr3(s) + 3NaBr*DyBr3(s)} eutectic mixture melts at 709 K giving a liquid of the molar composition x(NaBr) = 0.62. The 3NaBr*DyBr3(s) phase melts peritectically at 765 K. The phase diagram obtained in the present study virtually agrees with the calculated one available in literature.