Modified entrainment method for measuring vapour pressures and heterogeneous equilibrium constants. Part 4.—The gallium arsenide/hydrogen chloride system

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Abstract
The modified entrainment method described earlier has been used to study the GaAs/HCl system. Above about 900 K, the principal gallium vapour species is the monochloride, for which ΔH° f298=–63.2 ± 3 kJ mol–1 and S° 298= 247 ± 2 J mol–1K–1. Below this temperature, another gallium species thought to be GaCl2 becomes important.