The vaporization of GaAs has been investigated by means of the mass spectrometric method. The activity values of the components were determined in a composition range of 50–95 at.% Ga at 1283°K. The heteronuclear gaseous species GaAs was detected by the aid of double-oven experiments. Its dissociation energy D°298 = 50.1 ± 0.3 kcal mole−1 was determined using the third-law method. The equilibrium reaction As4⇋2As2 was considered in the study of the vapor over GaAs. Second-law and third-law values D°298 = 77 ± 5 and 73.5 ± 0.3 kcal mole−1, respectively, for the As2–As2 bond were obtained. The value D°298 = 71.0 ± 3.0 kcal mole−1 is proposed as a result of comparison with previous determinations.
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Maria et al. (1970) studied this question.
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