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]
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-31-109-ENG-38
- OSTI ID:
- 7087601
- Report Number(s):
- CONF-770662-2; TRN: 77-019255
- Resource Relation:
- Conference: International colloquium on refractory oxides for high temperature energy sources, Odeillo, France, 28 Jun 1977
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
CERIUM OXIDES
THERMODYNAMIC PROPERTIES
NEODYMIUM OXIDES
PLUTONIUM OXIDES
URANIUM OXIDES
EVAPORATION
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
ACTINIDE COMPOUNDS
CERIUM COMPOUNDS
CHALCOGENIDES
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLUTONIUM COMPOUNDS
RARE EARTH COMPOUNDS
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties
360204 - Ceramics
Cermets
& Refractories- Physical Properties