Volume 64, 1968

Mass spectrometric studies at high temperatures. Part 30.—Vaporization of Ga2S3, Ga2Se3 and Ga2Te3, and stabilities of the gaseous gallium chalcogenides

Abstract

The vaporization processes for Ga2S3, Ga2Se3 and Ga2Te3 have been studied at elecated temperatures by the Knudsen effusion and mass spectrometric techniques. The solids vapourize primarily by the reaction Ga2X3(s)= Ga2X(g), where ×= S, Se and Te. The heats of reaction at 298°K for the sulphide, selenide and telluride were 161 ± 6, 168 ± 7 and 162 ± 7 kcal mole–1, respectively. The gaseous molecules GaTe, Ga2Te2 and GaTe3 and the following gaseous equilibria were studied : 2 GaTe(g)=Ga2Te(g)+½Te2(gH298=–26±4 kcal mole–1, GaTe2(g)= GaTe(g)+½Te2(gH298= 22±4 kcal mole–1, 2 GaTe(g)=Ga2Te2(g)ΔHr,1012=–62±3 kcal mole–1

The atomization energies for the gaseous gallium chalcogenides were estimated to be D0(Ga2S)= 189 ± 7 kcal mole–1, D0(Ga2Se)= 149 ± 8 kcal mole–1, D0(Ga2Te)= 119 ± 7 kcal mole–1, D0(GaTe)= 59 ± 6 kcal mole–1, and D0(GaTe2)= 211 ± 6 kcal mole–1.

Article information

Article type
Paper

Trans. Faraday Soc., 1968,64, 2998-3005

Mass spectrometric studies at high temperatures. Part 30.—Vaporization of Ga2S3, Ga2Se3 and Ga2Te3, and stabilities of the gaseous gallium chalcogenides

O. M. Uy, D. W. Muenow, P. J. Ficalora and J. L. Margrave, Trans. Faraday Soc., 1968, 64, 2998 DOI: 10.1039/TF9686402998

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