Abstract
Equilibrium relationships in the uranium-manganese-oxygen system in air have been investigated as a function of temperature. Various mixtures of U/sub 3/O/sub 8/ and MnO/sub 2/ were heated and from the compositions reached at various temperatures, a ternary isobaric diagram was constructed showing the composition and phase changes occurring in air. Three ternary nonstoichiometric phases were found to exist over wide composition ranges with the nominal compositions MnU/sub 2/O/sub 7/, MnUO/sub 4/, and MnU/sub 2/O/sub 6/. The MnU/sub 2/O/sub 7/ dissociated at 1040/sup 0/C to MnUO/sub 4/ and U/sub 3/O/sub 8/; MnUO/sub 4/ was found to be stable only between 930 and 1175/sup 0/C, while MnU/sub 2/O/sub 6/ exists above 1130/sup 0/C.
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