Abstract
Se vapor pressures were measured by the dew point method for the binary system Ga 1· x Se x , 0.60 < x < 1.00 (Ga 2Se 3-Se), between 700 and 1050°C. The Se vapor pressure was found to decrease rapidly near x = 60 atomic% Se. The T- X and P- X liquidus curves are thermodymanically modelled by a regular associated solution model for the liquid phase, with the associate, Ga 2Se 3. The best fit to the data was obtained with 4000 cal/mole of Ga 2Se 3 for the regular solution interaction parameter and 0.10 for the degree of dissociation in the stoichiometric liquid ( x = 0.60).
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