Conclusions
A closed solid electrolyte cell, permitting reliable values of\(\Delta \bar G_{O_2 } \) to be obtained up to −775 kJ/mole, using a ceramic oxygen pump of stabilized ZrO2, was developed. The temperature dependence of\(\Delta \bar G_{O_2 } \) of uranium dioxide was determined for O/U=2.0039; 2.0021; 2.0018; 2.0012; 2.0009, and 2.0006. Coulometric titration of uranium dioxide was performed in the range of O/U from 2.0039 to 1.9991, and the influence of the degree of nonstoichiometry on\(\Delta \bar G_{O_2 } \) was studied at 1273°K. A very strong dependence of\(\Delta \bar G_{O_2 } = f(O/U)\) at 1273°K was demonstrated in the range of O/U from 2.0001 to 1.9999. A change in O/U by 0.01% causes a 70% decrease in\(\Delta \bar G_{O_2 } \).
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Translated from Atomnaya Énergiya, Vol. 51, No. 4, pp. 228–230, October, 1981.
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Baranov, V.G., Godin, Y.G. Chemical potential of oxygen of UO2 close to stoichiometry. At Energy 51, 633–636 (1981). https://doi.org/10.1007/BF01124040
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DOI: https://doi.org/10.1007/BF01124040