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Vaporization Of Compounds And Alloys At High Temperatures Part XVII. Thermodynamic Study Of Tin Selenide and Tin Telluride Using A Mass Spectrometer

Report Number: WADD TR 60-782 Part XVII
Author: Colin, R.
Author: Drowart, J.
Corporate Author: Universite Libre de Bruxelles, Brussels, Belgium
Laboratory: Air Force Materials Laboratory
Date of Publication: 1964-09
Pages: 27
Contract: AF 61(052)-225
Project: 7350
Task: 735001
AD Number: AD0607792


In a mass spectrometric investigation of the vapor in equilibrium with solid SnSe and solid SnTe, a number of reaction enthalpies were measured which combined with known thermochemical data yield:

Sn(s) + Se(s) -> SnSe(s) ΔH°298,f(SnSe)= -19.9±2.0 kcal/mole
Sn(s) + Te(s) -> SnTe(s) ΔH°298,f(SnTe)= -14.5±2.0 "
SnSe(g) -> Sn(g) + Se(g) D°0(SnSe) = 95.0±3.0 "
SnTe(g) -> Sn(g) + Te(g) D°0(SnSe) = 79.8±3.0 "
Sn2Se2(g) -> 2SnSe(g) ΔH°298,dim(SnSe)= 45.6±5.0 "
Sn2Te2(g) -> 2SnTe(g) ΔH°298,dim(SnTe)= 46.8±6.0 "
SnTe2(g) -> Sn + 2Te(g) ΔH°298,at(SnTe2)= 124.1±4.0 "

The dissociation energies are compared to the available spectroscopic data.

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