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In order to evaluate the feasibility of selective sulfidization of uranium and rare-earth(RE) oxides, an analysis on ther-modynamic data, such as M-O 2 -S 2 phase stability diagram and changes of Gibbs free energy for sulfidization of uranium andrare-earth oxides were carried out. Comparing RE-O 2 -S 2 with U-O 2 -S 2 phase stability diagram at wide range of sulfur potential,UO 2 remains unreacted, while RE oxides are sulfidized. The Gibbs free energy change(∆G o ) of sulfidization of RE oxides islower than that of uranium oxides. Thus, the selective formation of RE sulfides is possible during sulfidization of RE and ura-nium oxides at lower temperature. CS 2 was selected as a sulfidizing agent, because it is a stronger sulfidizing agent than otheragents and reacts at lower temperature.Key words :Uranium, Rare-earth, Oxides, Sulfides, Sulfidization 1.               .  (UO 2 )           .    (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, RE: rare earth)          50%  .    Nd, Sm Eu

Study on Thermodynamic Properties of Sulfidization for Uranium and Rare Earth Oxides