Thermal stability of zirconia-s and thoria-base fuels (LWBR Development Program) [electronic resource].
- Columbus, Ohio : Battelle Memorial Institute, 1967. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 27 : digital, PDF file
- Additional Creators:
- Battelle Memorial Institute and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Vapor densities and/or dissociation pressures of UO/sub 2/, ThO/sub 2/, ZrO/sub 2/, ThO/sub 2/-8 and -20 wt % UO/sub 2/, and ZrO/sub 2/-20 and -50 wt % UO/sub 2/ were obtained in the range from 2000 to 3000/sup 0/K by the transpiration technique. The UO/sub 2/-ZrO/sub 2/ system exhibited marked positive deviation from ideality, indicative of a strong tendency toward immiscibility. The UO/sub 2/-ThO/sub 2/ system was found to behave almost ideally. On the basis of the vapor pressures of UO/sub 2/ and of ThO/sub 2/ and the activity values it would be expected that compositions containing 1 mole % or more of UO/sub 2/ would volatilize by preferentially losing UO/sub 2/. A composition containing slightly less than 1 mole % UO/sub 2/ should prove to be the congruently subliming composition. O/sub 2/-dissociation pressures were determined for stoichiometric UO/sub 2/ and for a composition on either side of the stoichiometric one. At 2360/sup 0/K, UO/sub 2.03 +- 0.01/, UO/sub 2.00 +- 0.01/, and UO/sub 1.97 +- 0.01/ exhibited O/sub 2/-dissociation pressures of 1 x 10/sup -7/, 4.3 x 10/sup -10/, and 3 x 10/sup -12/ atm, respectively. From determinations of vapor density and measurements of O/sub 2/ pressure, pressure-temperature-composition relations were established for UO/sub 2/ over a small range of compositions encompassing UO/sub 2/./sub 00/. (NSA 21: 11294)
- Published through SciTech Connect., 01/06/1967., "bmi-1789", and Alexander, C A; Ogden, J S; Cunningham, G W.
- Funding Information:
- AT(11-1)-GEN-14, W-7405-ENG-92, and SUB73-14-1216
View MARC record | catkey: 14463466