Some aspects of the high temperature vaporization behavior and valence effects in actinide-oxide rare-earth-oxide systems. [Nd/sub 2/O/sub 3/; U--Nd--O; U--Pu--O; U--Pu--Ce--O]
Conference
·
OSTI ID:7087601
The vaporization behavior of the neodymium sesquioxide phase has been studied as a function of oxygen partial pressure in the temperature range from 2155 to 2485/sup 0/K. Oxygen potentials for the U-Nd-O system, where Nd/(U + Nd) = 0.1 and 0.2, are higher than those obtained with unalloyed urania. A significant increase in oxygen potential occurs when cerium is incorporated into the lattice of the U-Pu-O system for actinide ratio of Pu/(U + Pu) = 0.2 and cerium-to-metal ratio Ce/(U + Pu + Ce) = 0.05. Measurements of oxygen potential at 2050 K above hypostoichiometric U-Pu-O compositions having plutonium-to-metal ratios ranging from 0.15 to 0.30 indicate that for a given plutonium valence, the oxygen potential is dependent on the plutonium-to-metal ratio. Total pressures of actinide-bearing species estimated from our experimental oxygen potentials and the free energies of formation of the gaseous and condensed phases are in good agreement with those obtained from analysis of sublimates collected during transpiration experiments.
- Research Organization:
- Argonne National Lab., Ill. (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7087601
- Report Number(s):
- CONF-770662-2
- 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
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
EVAPORATION
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLUTONIUM COMPOUNDS
PLUTONIUM OXIDES
RARE EARTH COMPOUNDS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
URANIUM OXIDES
VERY HIGH TEMPERATURE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
EVAPORATION
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLUTONIUM COMPOUNDS
PLUTONIUM OXIDES
RARE EARTH COMPOUNDS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
URANIUM OXIDES
VERY HIGH TEMPERATURE