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Uranyl oxide hydrate phases with heavy lanthanide ions: [Ln(UO2)2O3(OH)].0.5H2O (Ln = Tb, Dy, Ho and Yb)

Abstract

Four uranyl oxide hydrate phases with heavy lanthanide ions, [Ln(UO2)2O3(OH)]0.5H2O [Ln = Tb (1), Dy (2), Ho (3) and Yb (4)], have been synthesized under hydrothermal conditions at 240 oC and characterized. SEM-EDS revealed that these phases have very similar thin plate morphologies with U to Ln atomic ratio of 2:1, which is further confirmed by TEM-EDS. High magnification TEM bright field images exhibited small crystalline domains (2‒5 nm) with preferred crystal orientations. Both XRD and TEM SAED confirmed that they crystallize in the trigonal crystal system with P-3m1 space group. Raman characterization revealed the typical vibration modes for uranyl units with the calculated U=O bond lengths being comparable to the values reported on other UOH phases with d-transition metal ions as interlayer species. The possible presence of a pentavalent uranyl unit has been ruled out by UV-vis-NIR spectroscopy. Thermal and optical properties have also been investigated and reported.

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Publication details

The article was received on 20 Mar 2018, accepted on 15 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8NJ01376D
Citation: New J. Chem., 2018, Accepted Manuscript
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    Uranyl oxide hydrate phases with heavy lanthanide ions: [Ln(UO2)2O3(OH)].0.5H2O (Ln = Tb, Dy, Ho and Yb)

    Y. Zhang, R. Aughterson, I. Karatchevtseva, L. Kong, T. T. Tran, J. Cejka, I. Aharonovich and G. R. Lumpkin, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01376D

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