Thermodynamic Properties of Nonstoichiometric Urania-Zirconia Solid Solutions

Abstract

Thermodynamic information has been obtained, at temperatures in the neighborhood of 1000°C, on nonstoichiometric urania‐zirconia solid solutions, U_yZr_1−yO_2+x, with y values of 0.90, 0.80, and 0.70 and x values between 0.04 and 0.17. A solid‐state electrochemical technique was used. Partial molar free energies, entropies, and enthalpies of solution of oxygen in the solid were calculated. The results are compared with results previously obtained on nonstoichiometric urania and urania‐thoria solid solutions.