Charge Distribution in U1–xCexO2+y Nanoparticles,Inorganic Chemistry

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Charge Distribution in U1–xCexO2+y Nanoparticles
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-09-15 , DOI: 10.1021/acs.inorgchem.1c01071
Damien Prieur _{1,

2} , Jean-François Vigier ₃ , Karin Popa ₃ , Olaf Walter ₃ , Oliver Dieste ₃ , Zsolt Varga ₃ , Aaron Beck ₄ , Tonya Vitova ₄ , Andreas C Scheinost _{1,

2} , Philippe M Martin ₅

Affiliation

In view of safe management of the nuclear wastes, a sound knowledge of the atomic-scale properties of U_1–xM_xO_2+y nanoparticles is essential. In particular, their cation valences and oxygen stoichiometries are of great interest as these properties drive their diffusion and migration behaviors into the environment. Here, we present an in-depth study of U_1–xCe_xO_2+y, over the full compositional domain, by combining X-ray diffraction and high-energy resolution fluorescence detection X-ray absorption near-edge structure. We show, on one hand, the coexistence of U^IV, U^V, and U^VI and, on the other hand, that the fluorite structure is maintained despite this charge distribution.

中文翻译：

U1–xCexO2+y 纳米粒子中的电荷分布

考虑到核废料的安全管理，对 U _{1– x} M _x O _{2+ y}纳米粒子的原子级特性有充分的了解是必不可少的。特别是，它们的阳离子化合价和氧化学计量学引起了人们极大的兴趣，因为这些特性推动了它们向环境中的扩散和迁移行为。在这里，我们通过结合 X 射线衍射和高能分辨率荧光检测 X 射线吸收近边结构，在整个组成域上对 U _{1– x} Ce _x O _{2+ y 进行}了深入研究。一方面，我们展示了 U ^IV、U ^V和 U的共存^VI，另一方面，尽管有这种电荷分布，但仍保持萤石结构。

更新日期：2021-10-04

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