High-Temperature Reactions of Uranium Dioxide With Various Metal Oxides

The high-temperature reactions of UO2 with 15 metal oixdes are described, usually in the form of phase-equilibrium diagrams, from data determined at the National Bureau of Standards and from a survey of the available literature.The systems are discussed in groups according to the cation valence of the second oxide; the divalent oxides BeO, MgO, CaO, SrO,BaO, and CuO; the trivalent oxides AI2O3, Y2O3, and Nd203; the tetravalent oxides Si02, Zr02, Sn02, Ce02, and Th02; and the pentavalent oxide VuOs.A brief review is presented for the relations in the U-0 system, particularly in the region of U02.Detailed descriptions of the equipment and the procedures used for the National Bureau of Standards investi gation are included in an appendix.