Filling the gaps of uranium oxide hydrates with magnesium(<scp>ii</scp>) ions: unique layered structures and the role of additional sodium(<scp>i</scp>) ions

Zhang, Yingjie; Lu, Kimbal T.; Wei, Tao; Karatchevtseva, I.; Zheng, Rongkun

doi:10.1039/d3dt03078d

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2024

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Cited by 2 publications

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“…11 In terms of secondary cations for the synthetic UOH materials, alkali and alkaline earth metal ions dominate. [12][13][14][15][16][17][18] However, UOHs with transition metals, [19][20][21][22] lead 23 and lanthanide ions [24][25][26] have also been studied and reported recently.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang,

Ablott,

Nicholas

et al. 2024

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

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

Zhang,

Ablott,

Nicholas

et al. 2024

Dalton Trans.

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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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Filling the gaps of uranium oxide hydrates with magnesium(ii) ions: unique layered structures and the role of additional sodium(i) ions

Abstract: Three novel uranium oxide hydrate phases, with Mg2+ or Mg2+ and Na+ ions, were synthesised hydrothermally and characterised using a range of structural and spectroscopic techniques.

Cited by 2 publications

References 67 publications

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

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

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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