Thermodynamic properties of nonstoichiometric urania-gadolinia solid solutions in the temperature range 700–1100° C |
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Authors: | K. Une M. Oguma |
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Affiliation: | Nippon Nuclear Fuel Development Co., Ltd., 2163, Narita-machi, ōarai-machi, Higashi Ibaraki, Ibaraki 311-13, Japan |
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Abstract: | Partial molar thermodynamic quantities for urania-gadolinia solid solutions of compositions U1−yGdyO2+x, with y values of 0.04 to 0.27, have been obtained using a solid electrolyte galvanic cell technique. The measurements were made for O/M ratios ranging from near stoichiometry to 2.20, and for temperatures ranging from 700 to 1100°C. The results for pure UO2+x are in accordance with data reported earlier. The oxygen potentials for U1−yGdyO2+x are higher than for pure UO2+x and increase positively with increasing Gd content or excess oxygen. They can be represented as a function of the mean U valence, except at the stoichiometric composition. Both the partial molar entropy and enthalpy increase negatively with increasing Gd content or excess oxygen. |
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