Effect of added gadolinium oxide on the thermal air oxidation of uranium dioxide

Randall D. Scheele,Brady D. Hanson,Andrew M. Casella

Journal of Nuclear Materials（2021）

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摘要

•Gd affects UO2 oxidation onset minimally, slows 1st step, & delays 2nd step onset.•Gd content affects kinetic mechanisms for 1st and 2nd U oxidation steps.•UO2 oxidation proceeds through at least three steps rather than reported two.•UO2 oxidizes to U3O7/U4O9 via Phase Boundary transitioning to Nucleation & Growth.•U3O7/U4O9 oxidizes to U3O8 via Nucleation & Growth transitioning to Phase Boundary.

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关键词

Air oxidation uranium dioxide,Air oxidation gadolinium-doped uranium oxide,Kinetic mechanisms air oxidation uranium dioxide

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