Mass spectrometric determination of dissociation energies of high-temperature molecules: ScS, YS, LaS, ZrS, UO
Journal Article
·
· High Temp. Sci.; (United States)
OSTI ID:7351194
Gaseous isomolecular equilibria of types MS + N = NS + M and MO + N = NO + M, where M and N are variously the elements Sc, Y, La, Zr, and U, were studied mass spectrometrically, over appropriate mixed solid phases heated in a tungsten Knudsen cell. Dissociation energies were derived, using as reference values D/sub 0//sup 0/(US) = 124.0 +- 2.3, D/sub 0//sup 0/(YS) = 125.4 +- 2.5, and D/sub 0//sup 0/(YO) = 170.0 +- 3.0 kcal/mole. ''Preferred values'' obtained by considering the results of the present study and literature values are ScS, 113.4 +- 3.0; YS, 125.4 +- 2.5; LaS, 136.0 +- 3.0; ZrS, 136.6 +- 4.0; and UO, 181.0 +- 4.0 kcal/mole. Determination of ground state degeneracies of US and UO by calculating the electronic entropies of the molecules was attempted. 4 tables, 33 references.
- Research Organization:
- Ames Lab., IA
- OSTI ID:
- 7351194
- Journal Information:
- High Temp. Sci.; (United States), Journal Name: High Temp. Sci.; (United States) Vol. 7:4; ISSN HITSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
CHALCOGENIDES
DISSOCIATION ENERGY
ENERGY
FLUIDS
GASES
LANTHANUM COMPOUNDS
LANTHANUM SULFIDES
MASS SPECTROSCOPY
MOLECULES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SCANDIUM COMPOUNDS
SCANDIUM SULFIDES
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
URANIUM COMPOUNDS
URANIUM OXIDES
YTTRIUM COMPOUNDS
YTTRIUM SULFIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM SULFIDES
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
CHALCOGENIDES
DISSOCIATION ENERGY
ENERGY
FLUIDS
GASES
LANTHANUM COMPOUNDS
LANTHANUM SULFIDES
MASS SPECTROSCOPY
MOLECULES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SCANDIUM COMPOUNDS
SCANDIUM SULFIDES
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
URANIUM COMPOUNDS
URANIUM OXIDES
YTTRIUM COMPOUNDS
YTTRIUM SULFIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM SULFIDES