Chemistry of lower valent actinide halides
This research effort was concerned almost entirely with the first two members of the actinide series, thorium and uranium, although the work was later extended to some aspects of the neptunium-fluorine system in a collaborative program with Los Alamos National Laboratory. Detailed information about the lighter actinides will be helpful in modeling the properties of the heavier actinide compounds, which will be much more difficult to study experimentally. In this program, thermochemical information was obtained from high temperature equilibrium measurements made by effusion-beam mass spectrometry and by effusion-pressure techniques. Data were derived primarily from second-law analysis so as to avoid potential errors in third-law calculations resulting from uncertainties in spectroscopic and molecular constants. This approach has the additional advantage of yielding reaction entropies that can be checked for consistency with various molecular constant assignments for the species involved. In the U-F, U-Cl, and U-Br systems, all of the gaseous species UX, UX{sub 2}, UX{sub 3}, UX{sub 4}, and UX{sub 5}, where X represents the halogen, were identified and characterized; the corresponding species ThX, ThX{sub 2}, ThX{sub 3}, and ThX{sub 4} were studied in the Th-F, Th-Cl, and Th-Br systems. A number of oxyhalide species in the systems U-0-F, U-0-Cl, Th-0-F, and Th-O-Cl were studied thermochemically. Additionally, the sublimation thermodynamics of NpF{sub 4}(s) and NpO{sub 2}F{sub 2}(s) were studied by mass spectrometry.
- Research Organization:
- SRI International, Menlo Park, CA (United States). Materials Research and Chemical Engineering Lab.
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-89ER13986
- OSTI ID:
- 7047424
- Report Number(s):
- DOE/ER/13986-T1; ON: DE92017031
- Country of Publication:
- United States
- Language:
- English
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ACTINIDE COMPOUNDS
ATOMIC IONS
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
DOCUMENT TYPES
ENTROPY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONIZATION POTENTIAL
IONS
MASS SPECTROSCOPY
NEPTUNIUM COMPOUNDS
NEPTUNIUM FLUORIDES
OXYCHLORIDES
OXYFLUORIDES
OXYGEN COMPOUNDS
OXYHALIDES
PHYSICAL PROPERTIES
PROGRESS REPORT
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
RUTHENIUM FLUORIDES
SPECTROSCOPY
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
THORIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
VAPOR PRESSURE