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Vaporization Of Compounds And Alloys At High Temperatures Part XXIII. Thermochemical Study Of The Germanium Oxides Using A Mass Spectrometer -T he Dissociation Energy Of The Molecule GeO

Report Number: WADD TR 60-782 Part XXIII
Author: Drowart, J.
Author: Verhaegen, G.
Author: Colin, R.
Author: Degreve, F.
Corporate Author: Universite Libre de Bruxelles, Brussels, Belgium
Laboratory: Air Force Materials Laboratory
Date of Publication: 1964-09
Pages: 34
Contract: AF 61(052)-225
Project: 7350
Task: 735001
AD Number: AD0607511

Abstract:

The mass spectrometric study of the vaporization of the compounds GeO2 (hex) and GeO(am) and of the mixture GeO2(hex) + Ge(c) made it possible to establish their mode of vaporization:

GeO2(hex) - GeO(g) + I/2O2(I)

n GeO(am) - (GeO)n(g) (n=1, 2, 3)(II)

n/2 GeO2(hex) + n/2 Ge(c) - (GeO)n(g) (n = 1, 2, 3)(III)

The enthalpies of vaporization are:

ΔH°298(I) = 121.2±1.6 kcal/ mole

ΔH°298(II, n = 1) = 53.4±1.0 kcal/mole

ΔH°298(III, n = 1) = 58.2±1.0 kcal/mole

The polymerization energies are:

ΔH°298(GeO-GeO) = 44.7±3.0 kcal/mole

ΔH°298(GeO-GeO-GeO)= 88.5±5.0 kcal/mole

Total pressures given in the literature were reinterpreted taking the presence of the polymers into account.

The heat of formation of the metastable compound GeO(am) obtained is ΔH°f(GeO) = -59.6±0.7 kcal/mole.

The dissociation energy of the gaseous molecule GeO D:(GeO) = 157.4±1.5 kcal/mole.



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