Influence of the conditions of formation on the structure and phase composition of subsurface layers of uranium coated with the high-temperature oxide
S. A. VoronovCentral Physicotechnical Institute, Sergiev Posad-7I. D. GoncharovInstitute of High-Pressure Physics, Russian Academy of Sciences, TroitskA. Yu. KashinInstitute of High-Pressure Physics, Russian Academy of Sciences, TroitskN. N. SkasyrskayaInstitute of High-Pressure Physics, Russian Academy of Sciences, TroitskV. P. TukmakovCentral Physicotechnical Institute, Sergiev Posad-7
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It is established by x-ray structure analysis that the oxide film formed on the surface of uranium during oxidation by dry oxygen at pressures of 0.1–0.001 Pa and temperatures of 500–700 °C for several hours consists of UO2 with U4O9 inclusions. Near the surface of the uranium the temperature of the α→β phase transition is lowered by 150–160 °C in comparison with the transition in the bulk of the metal, and the low-temperature stabilization of the β phase of uranium is observed.
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