Abstract
To evaluate the character of the changes in the thermodynamic properties of mixed uranium-plutonium oxide fuel having high reactivity and toxicity, measurements have been performed on uranium-cerium oxides with analogous properties. The electromotive force of a solid-electrolyte galvanic cell and solid-phase coulonometric titration were used to establish the regularities of the variation of the oxygen potential versus the oxygen/metal ratio for the oxide U 0.718 Ce 0.282 O 2-x . A thermodynamic model of uranium dioxide with elements dissolved in the matrix was developed; the model makes it possible to determine the oxygen potential in a wide interval of temperatures and non-stoichiometry.
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