Phasengleichgewichte in den systemen UO2-UO2,67-ThO2 und UO2 + x-NPO2 |
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Authors: | R PaulC Keller |
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Affiliation: | Institut für Radiochemie., Kernforschungszentrum, Karlsruhe, Postfach 3640, Deustchland |
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Abstract: | Solid-state chemical investigations have established that in the compositional range UO2-UO2.67-ThO3 of the U-Th-O ternary system, the following single-phase domains exist: U3O8, which does not dissolve any ThO2 in the solid state; an ordered M4O9 phase on the section between U4O9 and U2Th2O9, below ≈ 1150 °C; and a phase with fluorite structure which occupies a large part of the system and which at 1250 °C is bounded by the compositions UO2-UO2.25 (U0.43, ThO0.57)O0.25-ThO3. The maximum O/M ratio of the “fluorite” phase is O:(U + Th) = 2.25. The highest oxidation valency of uranium is 5.30; this value falls as more thorium oxide is incorporated in the (U.Th)O2 + x “fluorite” phase. |
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