Critical examination of Ga2Se3 phase equilibria

The Ga₂Se₃ phase equilibria were examined by DTA, X-ray diffractometry, visual observation, and isothermal crystal growth to resolve discrepancies in the reported binary phase diagrams. The Se-rich solid solubility extends to less than 60.5 at. % Se. There is no peritectic transformation at 880°C, nor is there a liquid immiscibility from 75 to 85 at. % Se. The rate of crystal growth influences the incorporation of lattice defects and thus determines which polymorphic form of Ga₂Se₃ crystallizes from the melt. The preferred liquidus curve from 60 to 100 at. % Se is presented and compared to those reported in the literature.