Melt–Vapor Phase Transition in the Aluminum–Selenium System in Vacuum

The boundaries of liquid and vapor coexistence fields at pressures 101.3 0.133 kPa were calculated based on the partial pressure values components in Al-Al2Se3 Al2Se3-Se systems. more volatile aluminum selenide selenium above systems determined by isothermal version boiling-point method. fewer numerical integration Gibbs–Duhem equation. integral thermodynamic functions formation evaporation solutions system components. Based analysis complete phase diagram, it was found that purification vacuum distillation a single operation can remove an appropriate rate. from melts whole concentration range will proceed mixture solution with Al2Se3 cryst., accumulation latter residue.