Thermochemistry of the gaseous thorium bromides
- SRI International, Menlo Park, California 94025 (USA)
The sublimation of ThBr{sub 4}(s) was studied by the torsion-effusion and mass spectrometric methods in the range 600--750 K; only monomeric ThBr{sub 4} vapor was observed, and the pertinent thermodynamic parameters were derived. The gaseous lower-valent species ThBr{sub 3}, ThBr{sub 2}, and ThBr were identified in the bromination of Th(s) at 1500 to 2000 K, and several reaction equilibria involving these species were studied by mass spectrometry over wide temperature ranges for second law analysis. Reaction enthalpies, bond dissociation energies, and standard enthalpies of formation were derived from the results. Unlike ThF{sub 4} and ThCl{sub 4}, the sublimation entropy indicates that ThBr{sub 4} may have a distorted tetrahedral structure. Bond dissociation energies and related thermodynamic properties are discussed and compared with values in other thorium and uranium halides.
- OSTI ID:
- 6290426
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:8; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
KINETICS
MASS SPECTROSCOPY
MOLECULAR STRUCTURE
REACTION KINETICS
SPECTROSCOPY
THERMODYNAMICS
THORIUM BROMIDES
THORIUM COMPOUNDS