混合 (IV) - (III) 氧酸盐的水热转化为U1-CeO2+·nH2O固体溶液
S Benarib1, N Dacheux1, X F Le Goff1
1ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France. nicolas.clavier@icsm.fr.
Dalton transactions (Cambridge, England : 2003)
|July 25, 2023
概括
-氧酸盐前体的水热转化产生混合的-氧化物固体溶液. pH影响形态,而反应时间影响同质性,为替代材料创造了可行的合成.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
- 放射化学 放射化学是指辐射化学.
背景情况:
- -氧化物固体溶液对于核废物管理和作为的替代品很重要.
- 热水合成为生产先进陶材料提供了一种可控的方法.
研究的目的:
- 开发一条用于-氧化物固体溶液的热水合成路径.
- 研究pH值和反应时间对产生的氧化物的结构,形态和同质性的影响.
- 探索在氧化矩阵中加入的可行性.
主要方法:
- 混合U(IV) -Ce(III) 氧酸盐前体的水热转化.
- 在250°C时变化的初始pH值和反应持续时间 (1-48小时).
- 使用扫描电子显微镜 (SEM) 和带有能量分散光谱 (TEM/EDS) 的传输电子显微镜进行表征.
- 热力学计算和O/M比率分析.
主要成果:
- 化物类型的U1-xCexO2+n·nH2O固体溶液已经成功合成.
- 最初的pH显著影响了形态:酸性pH产生了微球,性pH产生了纳米晶体聚合物.
- 单相混合氧化物在3小时内形成,阴离子分布随着时间的推移而缩小,导致高同质性.
- 在0.1到0.75.5之间的合率 (x) 中,形成是可能的.
结论:
- 水热转化是一种有效的方法,用于制备均的氧化物固体溶液.
- 对pH和反应时间的控制允许定制氧化物形态和均性.
- 这项研究提供了有关和在热水处理过程中的氧化还原行为的见解.
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