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和化物加载玻璃玻璃玻璃基质的结构特征
1Environmental Physics Department, HUN-REN Centre for Energy Research, Konkoly Thege St. 29-33, Budapest, 1121, Hungary.
Scientific reports
|August 4, 2025
概括
酸玻璃被研究用于放射性废物处理. 添加了和化物,如,和欧,影响了玻璃结构并增加了溶解.
科学领域:
- 材料科学 材料科学 材料科学
- 核工程 核工程是指核工程.
- 地质化学 地质化学
背景情况:
- 酸玻璃是固定高水平放射性废物的有希望的材料.
- 了解玻璃矩阵中的活性化物的结构和化学行为对于废物缩至关重要.
- 在实验研究中,兰化物作为三价性活性化物的化学替代品.
研究的目的:
- 研究将和兰坦氧化物联合纳入玻璃酸盐中的结构和化学效应.
- 评估这些元素对玻璃网的影响及其透性.
- 评估酸盐玻璃是否适用于处理含有和活性化物的废物.
主要方法:
- 同时将UO3和兰坦化氧化物 (CeO2,Nd2O3,Eu2O3) 装入玻璃玻璃基质中.
- 中子衍射和逆蒙特卡洛 (RMC) 模拟用于结构分析.
- 用于化学状态和深度分析的X射线吸收光谱 (XAS) 和X射线光电子光谱 (XPS).
- 漏试验用于评估材料的耐用性.
主要成果:
- 玻璃结构主要由SiO4和BO3/BO4单元组成.
- 主要以Ce (III) 的形式存在,而以U (V) 和U (VI) 的混合物形式存在.
- 作为一种中间氧化物,降低的协调作用.
- 兰化离子作为网络修饰剂,促进协调从3到4的转移,度增加.
- 在XPS中,U{IV}/U{VI}比率的深度依赖变化被发现.
- 与原始玻璃基质相比,漂水试验表明Si,B和Na的溶解增加.
结论:
- 和化物的加入显著改变了玻璃玻璃的结构和化学状态.
- 观察到的协调和特异化的变化对玻璃的稳定性和长期性能有影响.
- 网络形成者和修饰者的漏增加表明,在某些条件下,废物缩可能面临挑战.
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