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Vaporization Of Compounds And Alloys At High Temperature Part XI. Correlation of Dissociation Energies Of Gaseous Molecules And Of Heats Of Vaporization Heteronuclear Diatomic Molecules

Report Number: WADD TR 60-782 Part XI
Author: Colin, R.
Author: Goldfinger, P.
Corporate Author: Universite Libre de Bruxelles, Brussels, Belgium
Laboratory: Air Force Materials Laboratory
Date of Publication: 1963-05
Pages: 24
Contract: AF 61(052)-225
Project: 7350
Task: 735001
AD Number: AD0410893


Thermodynamic equations characterizing the chemical stability of heteronuclear diatomic molecules AB are presented. These equations permit one to predict the conditions in which yet unknown molecules can be observed. The chemical stability of the transition element chalcogenides is discussed.

A similarity in trend of the heat of vaporization of transition elements, the lattice energy and the dissociation energy of their chalcogenides is pointed out. AB molecules can be classified in groups for which the vlue of the ratio

α=ΔH°[at.ABsolid]/D° (AB)

is characteristic. This parameter is important for predicting the chemical stability and available values are reviewed.

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