Abstract
Mass spectrometric and weight loss measurements of the species effusing from a Knudsen cell containing GaAs were used to obtain vapor pressures over the temperature range 900–1200°K. The As 2 As 4 ratio was observed in these measurements to be substantially larger than previously reported 2.3 when precautions were taken to prevent the buildup of arsenic vapor in the mass spectrometer ionization chamber. A third law treatment of the data gave enthalpies for the reactions: GaAs (s)→ Ga (s) + 1 2 As 2(g) ΔH 298 0 = 44.9 kcal GaAs (s)→ Ga (s) + 1 4 As 4(g) ΔH 298 0 = 29.4 kcal 2As 2(g) → As 4(g) ΔH 298 0 = −62.5 kcal GaAs (s) → Ga (g) + As (g) ΔH 298 0 = 155 kcal These results were used to correct Thurmond's calculations of vapor pressures and activity coefficients along the GaAs liquidus. (1)
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