Abstract
Recently available spectroscopic data have been used to derive new values for the enthalpies of formation at 298.15 K of gaseous ThO, ThO2, UO, UO2, UO3, and PuO, and PuO2. These new values of δH 0 f (298.15 K) are in good agreement with previously recommended values for UO, UO2, and PuO, but not for the other molecules. Inconsistencies among evaluated thermodynamic data have been resolved for ThO (g) and UO3 (g). Recommended values are derived for PuO2 (g) and ThO2 (g); however, additional experimental work on these molecules is needed.
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D. W. Green, J. Nucl. Mater., 88: 51 (1980).
R. J. Ackermann, E. G. Rauh, and M. H. Rand, unpublished results. These results were presented at the American Ceramic Society 31st Pacific Coast Regional Meeting, October 1978, San Diego. The recommended free energy of formation of UO3 (g) is essentially that of R. J. Ackermann, R. J. Thorn, C. Alexander, and M. Tetenbaum, J. Phys. Chem. 64: 350 (1960).
The recommended free energy of formation of UO(g) is from data of M. Tetenbaum and P. D. Hunt, J. Nucl. Mater. 34: 86 (1970); J. Chem. Phys. 49: 4839 (1968); and R. J. Ackermann, E. G. Rauh, and M. S. Chandrasekharaih, J. Phys. Chem. 73: 762 (1969).
R. J. Ackermann, private communication (1978).
R. J. Ackermann, E. G. Rauh, and M. H. Rand, Proc. IAEA Int. Symp. Thermodyn. Nucl. Mater., Jülich, (1979).
A. Pattoret, J. Drowart, and S. Smoes, in Proc. Symp. Thermodyn. Nucl. Mater. (IAEA, Vienna, 1967).
M. H. Rand, in Plutonium: Physico-Chemical Properties of Its Compounds and Alloys, Atomic Energy Review, Vol. 4, Special Issue No. 1 (IAEA, Vienna, 1966).
R. J. Ackermann and M. Tetenbaum, High Temp. Sci., in press (1979).
M. H. Rand, in Thorium: Physico-Chemical Properties of Its Compounds and Alloys, Atomic Energy Review, Special Issue 5 (IAEA, Vienna, 1975).
JANAF Thermochemical Tables, 2nd edn., Natl. Bur. Stand. (U. S.), NSRDS-NBS37, Washington, 1971.
F. L. Oetting, M. H. Rand, and R. J. Ackermann, The Chemical Thermodynamics of Actinide Elements and Their Compounds (IAEA, Vienna, 1976).
S. D. Gabelnick, G. T. Reedy, and M. G. Chasanov, J. Chem. Phys. 58: 4468 (1973).
S. D. Gabelnick, G. T. Reedy, and M. G. Chasanov, J. Chem. Phys. 59: 6397 (1973).
D. W. Green and G. T. Reedy, J. Chem. Phys. 69: 544 (1978).
S. D. Gabelnick, G. T. Reedy, and M. G. Chasanov, J. Chem. Phys. 60: 1167 (1974).
D. W. Green, Calculation of the thermodynamic properties of fuel vapor species from spectroscopic data, Argonne National Laboratory Report ANL-CEN-RSD-80-2 (1980).
K. P. Huber and G. Herzberg, Molecular Spectra and Molecular Structure IV. Constants of Diatomic Molecules (Van Nostrand, New York, 1979).
E. G. Rauh and R. J. Ackermann, J. Chem. Phys. 60: 1396 (1974).
L. Brewer and G. Rosenblatt, Advances in High Temperature Chemistry, Vol 2, L. Eyring, ed. (Academic, New York, 1969.
R. J. Ackermann and E. G. Rauh, Rev. Int. Hautes Temp. Refr. 15: 259 (1978).
G. W. Charles, USAEC Report, ORNL-2319, May (1958).
D. W. Green, G. T. Reedy, and S. D. Gabelnick, submitted for publication (1980).
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Green, D.W. Standard enthalpies of formation of gaseous thorium, uranium, and plutonium oxides. Int J Thermophys 1, 61–71 (1980). https://doi.org/10.1007/BF00506272
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DOI: https://doi.org/10.1007/BF00506272