Abstract
The phase diagram of the system Ga-Se has been determined by the differential thermal analysis (DTA). The main features of the diagram are as follows: (1) the melting point of GaSe is 938±3°C and Ga2Se3 is 1005±3°C. (2) the monotectic transition occurs at 915°C in the lower composition region than 50 at.%Se. (3) the eutectic is formed at 884°C in the composition region between GaSe and Ga2Se3. (4) the solidified samples in the region between Ga2Se3 and Se consist of mixtures of Ga2Se3 and Se. At higher selenium composition, the DTA peaks observed at about 140°C and 45°C probably correspond to the crystallization and the glass transition of selenium respectively. In the composition region less than 50 at.%Se, the sublimation products consist of gallium and GaSe. The phases of Ga2Se and Ga3Se2 reported by other authors are not observed.
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