Capturing ammonium nitrate in a synthetic uranium oxide hydrate phase: revealing the role of ammonium ions and anion inclusions

Zhang, Yingjie; Ablott, Timothy A.; Nicholas, Maria K.; Karatchevtseva, Inna; Plášil, Jakub

doi:10.1039/d4dt01372g

Dalton Trans.

2024

DOI: 10.1039/d4dt01372g

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Capturing ammonium nitrate in a synthetic uranium oxide hydrate phase: revealing the role of ammonium ions and anion inclusions

Yingjie Zhang,

Timothy A. Ablott,

Maria K. Nicholas

et al.

Abstract: The role of ammonium ions on the formation of uranium oxide hydrate phases has been investigated, with interlayer hydrogen bonding and the inclusion of nitrate anions being revealed.

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Incorporating Transition Metal Ions into Uranium Oxide Hydrates: The Role of Zn(II) and the Effect of the Addition of Cs(I) Ions

Ablott,

Lu,

Zhang

2024

ACS Omega

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The synthesis of two zinc-bearing uranium oxide hydrate (UOH) materials has been achieved, and their crystal structures, obtained via single-crystal X-ray diffraction using synchrotron radiation, and additional structural and spectroscopic properties are reported herein. Although both structures incorporate Zn 2+ cations, the two differ significantly. The compound Zn 2 (OH) 2 (H 2 O) 5 [(UO 2 ) 10 UO 14 (H 2 O) 3 ] (UOHF-Zn), forming a framework-type structure in the P1̅ space group, was composed of β-U 3 O 8 layers pillared by uranyl polyhedra, with the Zn 2+ cations incorporated within the framework channels. In contrast, the compound Cs 2 Zn(Hcrystallized in the Cmc2 1 space group with a schoepite-like uranyl oxide hydroxide layered topology and both Zn 2+ and Cs + cations making up the interlayer species. The apparent driving force for the differences in the structures was the change from KOH to CsOH during synthesis, with the smaller K + ions excluded in lieu of a higher proportion of Zn 2+ (U/Zn ratio of 5.5:1) in UOHF-Zn, whereas in UOH-Zn, the larger Cs + ions were preferentially incorporated at the expense of fewer Zn 2+ cations (U/Cs/Zn ratio of 8:2:1). Highlighted in this work is the effect of the chemical species and, in particular, their ionic radius on UOH formation, further improving the understanding of UO 2 alteration in the setting of deep geological repositories.

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Incorporating Transition Metal Ions into Uranium Oxide Hydrates: The Role of Zn(II) and the Effect of the Addition of Cs(I) Ions

Ablott,

Lu,

Zhang

2024

ACS Omega

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Capturing ammonium nitrate in a synthetic uranium oxide hydrate phase: revealing the role of ammonium ions and anion inclusions

Abstract: The role of ammonium ions on the formation of uranium oxide hydrate phases has been investigated, with interlayer hydrogen bonding and the inclusion of nitrate anions being revealed.

Cited by 1 publication

References 69 publications

Incorporating Transition Metal Ions into Uranium Oxide Hydrates: The Role of Zn(II) and the Effect of the Addition of Cs(I) Ions

Incorporating Transition Metal Ions into Uranium Oxide Hydrates: The Role of Zn(II) and the Effect of the Addition of Cs(I) Ions

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