Study on the phase separation behavior of (U,Nd)3O8 powder by high temperature oxidation
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Several samples of (U1−xNdx)3O8 with different Nd content were prepared by different process. After high temperature oxidation, the final oxidized products were found to be a mixture of small particles Nd-rich (U1−yNdy)O2+v phases and large particles Nd-poor (U1−zNdz)3O8−w phases by XRD and SEM analysis. This study indicated that (U1−xNdx)3O8 powder formed a solid solution firstly at 1100 °C or high. The recrystallization of this solid solution happened and the RE-rich fluorite phase formed concurrently when the temperature began to decrease. The present work will provide more information to understand the oxidation behavior of rare-earth doped U3O8 phase at high temperature.
KeywordsSpent nuclear fuel High temperature oxidation Lanthanides Phase separation
This research is supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Nos. XDA21010202, XDA03010402), Young Scholar of CAS “Light of West China” Program for Fang-li Fan (No. 2016-84) and the Natural Sciences Foundation of Gansu Province (No. 17JR5RA298).
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Conflicts of interest
All authors have no conflicts of interest to declare.
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