在单相UO中氧缺陷配置2.15
William F Cureton1,2, Eric C O'Quinn1, Gianguido Baldinozzi3
1Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.
Inorganic chemistry
|August 11, 2025
概括
高温中子散射揭示了二氧化 (UO2.15) 中的氧缺陷集群. 扭曲的氧立方体最好地解释了当地的原子排列,完善了对UO2+x相态度的理解.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 核材料 核材料 核材料
背景情况:
- 了解U / O相位图对于核燃料性能至关重要.
- 超静态二氧化 (UO2+x) 呈现出复杂的缺陷结构.
- 以前的模型很难准确地描述UO2+x.中的局部原子排列.
研究的目的:
- 描述高温结构的超静态度UO2.15.15的高温结构.
- 调查UO2+x阶段内的局部原子排列和缺陷配置.
- 改进结构模型以检测二氧化中的氧缺陷.
主要方法:
- 在高温下进行了中子总散射实验.
- 对衍射数据的分析,包括对分布函数 (PDF).
- 将各种结构模型,包括缺陷集群配置,与实验数据相匹配.
主要成果:
- 在高温下证实了UO2.15.15的单相化物结构.
- 标准结构模型没有充分适应短程PDF数据.
- 包含氧缺陷集群的模型提供了更好的局部原子排列表现.
- 适度扭曲的氧气立方体,由分子动力学预测,显示出最适合.
结论:
- 在UO2.15中,局部原子排列最好用特定的氧缺陷集群来描述.
- 扭曲的氧立方体是UO2+x阶段局部结构的关键特征.
- 这些发现促进了对二氧化核燃料中缺陷化学的理解.
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