Abstract
The vibrational (IR and Raman) spectrum of Vandenbrandeite, Cu[UO2(OH)4], has been recorded and discussed on the basis of structural considerations through the use of empirical expressions. As the H-bonding in the lattice is poorly known, the characteristics of this bond has been analyzed with the aid of H/D isotope exchange, thermal assays and electron microscopy. Samples are practically amorphous to XRD up to ∼700°C whereas crystals morphologically different by SEM microscopy and well characterized by XRD technique are observed from ∼800°C. Vibrational spectroscopy reveals that the atomic arrangement in the structure remains largely unaffected as the dehydration proceeds, suggesting a topochemically controlled process. EPR spectroscopy suggests a disordered distribution of Cu(II) ions as temperature increases. Finally, thermal dehydroxylation and paragenesis of the copper-uranyl oxide hydrate are correlated.
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Botto, I.L., Barone, V.L. & Sanchez, M.A. Spectroscopic and thermal contribution to the structural characterization of vandenbrandeite. Journal of Materials Science 37, 177–183 (2002). https://doi.org/10.1023/A:1013182917829
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DOI: https://doi.org/10.1023/A:1013182917829