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Low-temperature sintering mechanism on uranium dioxide

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Abstract

Based on a point defect model, the mechanism of low-temperature sintering of uranium dioxide was studied in this paper. The diffusion coefficient of uranium in UO2 + x, sintering temperature and densification equation in low-temperature sintering were analyzed by both the point defect model and low-temperature sintering experiments. The results showed that the diffusion activation energy of uranium in over-stoichiometric UO2 + x was lowered by 3.0 ev than that in stoichiometric UO2. And the diffusion coefficient of uranium in UO2 + x was proportional to x2. In addition, the theoretical low temperature sintering temperature was calculated to be in the range of 1089–1151 °C, which indicated that it was necessary to maintain proper over-stoichiometric oxygen for low-temperature sintering process. Moreover, the calculation results by the point defect model matched perfectly with the experiment results, PDM might be a good model to describe the relationships between defects concentration and atmosphere composition.

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Authors and Affiliations

  1. College of Material Science and Engineering, Chongqing University, No. 174, ShaZheng Street, ShaPingBa District, Chongqing, 400030, China

    Jiacheng Gao, Xiaodong Yang, Rui Li, Yong Wang & Fengwei Zhong

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  1. Jiacheng Gao
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  2. Xiaodong Yang
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  3. Rui Li
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  4. Yong Wang
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  5. Fengwei Zhong
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Correspondence to Rui Li.

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Gao, J., Yang, X., Li, R. et al. Low-temperature sintering mechanism on uranium dioxide. J Mater Sci 42, 5936–5940 (2007). https://doi.org/10.1007/s10853-007-1774-8

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  • DOI: https://doi.org/10.1007/s10853-007-1774-8

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