在暴露于氧气下,从UCl3盐化合物中形成β-U3O8
Benjamin W Tuffy1, Nancy R Birkner2, Juliano Schorne-Pinto3
1School of Mechanical, Aerospace and Manufacturing Engineering, University of Connecticut, Storrs, Connecticut 06369-3139, United States.
The journal of physical chemistry. B
|November 5, 2024
概括
在化盐中的三化 (UCl3) 在高温下迅速形成氧化阶段. 这项研究使用了X射线吸收细结构和拉曼光谱来识别氧键和结构.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
- 核材料 核材料 核材料
背景情况:
- 三化 (UCl3) 是各种化学过程中的前体.
- 了解其在盐中的高温行为对于核燃料再加工和废物管理至关重要.
- 之前的研究集中在不同条件下的氧化合成.
研究的目的:
- 为了研究UCl3在化溶液中的高温相位形成.
- 描述加热过程中物种的结构变化和结合.
- 阐明这些系统中氧化形成的机制.
主要方法:
- 使用了互补的X射线吸收细结构 (XAFS) 和拉曼光谱法.
- 研究了在LiCl和KCl溶液中具有不同UCL3度的样本.
- 在高温 (高达800°C) 和室温下进行测量.
主要成果:
- 对XAFS和拉曼光谱的分析揭示了氧键的长度和对称性.
- 主导的高温阶段被确定为α-氧化物 (α-U3O8) 的β变异.
- 有证据表明,这种阶段从UCl3分解和与氧气反应中迅速形成.
结论:
- α-U3O8的β变异在含有UCl3的化溶液中在800°C迅速形成.
- 这种快速形成归因于化/氧化的分解和氧反应动力学.
- 这些发现与合成这种氧化阶段的传统缓慢冷却方法形成鲜明对比.
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