Uranyl oxide hydrate phases with heavy lanthanide ions: [Ln(UO2)2O3(OH)]·0.5H2O (Ln = Tb, Dy, Ho and Yb)
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Date
2018-05-16
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Publisher
Royal Society of Chemistry
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 °C and characterized. SEM-EDS revealed that these phases have very similar thin plate morphologies with a U to Ln atomic ratio of 2 : 1, which is further confirmed by TEM-EDS. Their high magnification TEM bright field images showed 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 the P[3 with combining macron]m1 space group. Raman characterization revealed the typical vibration modes for the uranyl units with the calculated U[double bond, length as m-dash]O bond lengths are comparable to the values reported for other UOH phases with d-transition metal ions as the interlayer species. The possible presence of a pentavalent uranyl unit has been ruled out by UV-vis-NIR spectroscopy. The thermal and optical properties have also been investigated and reported. © Royal Society of Chemistry 2025.
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Keywords
Oxides, Hydrates, Synthesis, Metals, Crystals, Spectroscopy, Ions, Uraninites, Minerals, X-ray diffraction, Photoluminescence
Citation
Zhang, Y., Aughterson, R., Karatchevtseva, I., Kong, L., Tran, T. T., Čejka, J., Aharonovich, I., & Lumpkin, G. R. (2018). Uranyl oxide hydrate phases with heavy lanthanide ions: [Ln(UO2)2O3(OH)]·0.5H2O (Ln = Tb, Dy, Ho and Yb). New Journal of Chemistry, 42(15), 12386–12393. doi:10.1039/C8NJ01376D