Abstract
The vapour pressure of GaS as a function of temperature has been determined. Below the melting point (962°C) the vapour conforms to the relation log P GaS (mm Hg) = − 23190 T + 19.39 and above the melting point to log P GaS (mm Hg) = − 6390 T + 5.74 Calculation of the equilibrium constant for the reaction 2 GaS (s) ⤦ 2 Ga (g) + S 2(g) leads to the expression K GaS = − 55536 T + 24.75 which is in accordance with the experimental results. This equilibrium constant is employed to calculate the minimum values of the p s 2 above GaS at different temperatures. The thermal stability of GaS have also been determined. The results explain the free gallium found in the crystal growth experiments when a carrier gas is used or when large evacuated tubes are employed.
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