Vapor pressures and vapor compositions in equilibrium with hypostoichiometric plutonium dioxide at high temperatures
Vapor pressures and vapor compositions have been calculated for 1500 less than or equal to T less than or equal to 4000/sup 0/K. Thermodynamic functions for the condensed phase and for each of the gaseous species were combined with an oxygen-potential model extended into the liquid region to obtain the partial pressures of O/sub 2/, O, Pu, PuO and PuO/sub 2/. The calculated oxygen pressures increase very rapidly as stoichiometry is approached. At least part of this increase is a consequence of the exclusion of Pu/sup 6 +/ from the oxygen-potential model. No reliable method was found to estimate the importance of this ion. As a result of large oxygen potentials at high temperatures, extremely high total pressures that produced unreasonably high vapor densities were calculated. The highest temperature was therefore limited to 400 K, and the range of oxygen-to-metal ratios was limited to 1.994 to 1.70. These calculations show that vapor in equilibrium with hypostoichiometric plutonium dioxide is poorly approximated as PuO/sub 2/ for most of the temperture and composition range of interest. The vapor is much more oxygen-rich than the condensed phase. Implications for the (U,Pu)O/sub 2-x/ system are discussed. (DLC)
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6481403
- Report Number(s):
- CONF-820909-19; ON: DE83007787
- Country of Publication:
- United States
- Language:
- English
Similar Records
Vapor pressures and vapor compositions in equilibrium with hypostoichiometric plutonium dioxide at high temperatures
Vapor pressures and vapor compositions in equilibrium with hypostoichiometric plutonium dioxide at high temperatures
Vapor pressures and vapor compositions in equilibrium with hypostoichiometric uranium-plutonium dioxide at high temperatures
Journal Article
·
Fri Dec 31 23:00:00 EST 1982
· ACS Symp. Ser.; (United States)
·
OSTI ID:6011086
Vapor pressures and vapor compositions in equilibrium with hypostoichiometric plutonium dioxide at high temperatures
Technical Report
·
Tue Jun 01 00:00:00 EDT 1982
·
OSTI ID:7031792
Vapor pressures and vapor compositions in equilibrium with hypostoichiometric uranium-plutonium dioxide at high temperatures
Conference
·
Thu Dec 31 23:00:00 EST 1981
·
OSTI ID:6487885
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
CHALCOGENIDES
DATA
FLUIDS
GASES
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLUTONIUM COMPOUNDS
PLUTONIUM DIOXIDE
PLUTONIUM OXIDES
TEMPERATURE DEPENDENCE
THEORETICAL DATA
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
VAPOR PRESSURE
VAPORS
VERY HIGH TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
CHALCOGENIDES
DATA
FLUIDS
GASES
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLUTONIUM COMPOUNDS
PLUTONIUM DIOXIDE
PLUTONIUM OXIDES
TEMPERATURE DEPENDENCE
THEORETICAL DATA
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
VAPOR PRESSURE
VAPORS
VERY HIGH TEMPERATURE