Vapor Pressures and Vapor Compositions in Equilibrium with Hypostoichiometric Uranium Dioxide at High Temperatures PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Thermodynamic functions of the gaseous species, thermodynamic functions of the condensed phase, and an oxygen-potential model have been combined to calculate the vapor pressures and vapor compositions in equilibrium with condensed-phase UO/sub 2-x/ for 1500 less than or equal to T less than or equal to 6000 K and 0 less than or equal to x less than or equal to 0.5. A method for extending the oxygen-potential model of Blackburn to the liquid region has been derived and evaluated. New thermodynamic functions of the UO2 condensed phase have been derived from the best available data, including the heat capacity recommended by Fink.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Thermodynamic functions of the gaseous species, thermodynamic functions of the condensed phase, and an oxygen-potential model have been combined to calculate the vapor pressures and vapor compositions in equilibrium with condensed-phase UO/sub 2-x/ for 1500 less than or equal to T less than or equal to 6000 K and 0 less than or equal to x less than or equal to 0.5. A method for extending the oxygen-potential model of Blackburn to the liquid region has been derived and evaluated. New thermodynamic functions of the UO2 condensed phase have been derived from the best available data, including the heat capacity recommended by Fink.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Vapor pressures and vapor compositions in equilibrium with a hypostoichiometric uranium-plutonium dioxide condensed phase (U/sub 1-y/Pu/sub y/)O/sub 2-x/, as functions of T, x, and y, have been calculated for 0.0 less than or equal to x less than or equal to 0.1, 0.0 less than or equal to y less than or equal to 0.3, and for the temperature range 2500 less than or equal to T less than or equal to 6000 K. The range of compositions and temperatures was limited to the region of interest to reactor safety analysis. Thermodynamic functions for the condensed phase and for each of the gaseous species were combined with an oxygen potential model to obtain partial pressures of O, O2, Pu, PuO, PuO2, U, UO, UO2, and UO3 as functions of T, x, and y.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Vapor pressures and vapor compositions have been calculated for 1500 less than or equal to T less than or equal to 4000°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 O2, O, Pu, PuO and PuO2. 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 PuO2 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).
Author: C. Ronchi Publisher: Springer Science & Business Media ISBN: 9783540221227 Category : Nature Languages : en Pages : 380
Book Description
The monograph deals with the thermodynamic properties of fluid uranium dioxide, one of the most investigated materials of the last century, up to its critical point. It presents an exhaustive theoretical introduction to "quasi-chemical" models of liquids, as well as their behaviour under non-congruent vaporisation conditions. Particular emphasis is given to the properties of pure Coulombic systems and to the pseudoparticle approach, which enables the partition function to be expressed in a simple, but physically rigorous formulation. The construction of the equation of state of stoichiometric and non-stoichiometric uranium dioxide is described in distinct steps, from a critical assessment of the theoretical fundamentals to a thorough review of the pertinent thermochemical and thermophysical data. Calculations of the thermodynamic properties of UO2+x are performed for temperatures up to 11,000 K both for the condensed and gas phase. More than one hundred tables are collected in the Appendix containing all relevant thermodynamic data.
Author: Raymond J. Ackermann Publisher: ISBN: Category : Materials at high temperatures Languages : en Pages : 116
Book Description
The investigation of phenomena at temperatures in excess of 1000 degrees C has only recently assumed a position of prominence in the broad field of physical chemistry.
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Author: C. Ronchi
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Author: Raymond J. Ackermann
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Author: Hans-Eberhard Schmidt