Molecular structure of the uranyl mineral zippeite - an XRD, SEM and Raman spectroscopic

Frost, Ray L., Weier, Matt L., Bostrom, Thor E., & Cejka, Jiri (2005) Molecular structure of the uranyl mineral zippeite - an XRD, SEM and Raman spectroscopic. Neues Jahrbuch fuer Mineralogie, Abhandlungen, 181(3), pp. 271-279.



Raman spectra at 298 and 77 K and infrared spectra of the uranyl sulfate mineral zippeite, K2[(UO2)6(SO4)3O(OH)6]. 4 H2O, were studied. Observed bands were tentatively attributed to the (UO2)2+ and (SO4)2- stretching and bending vibrations, the OH stretching vibrations of water molecules and hydroxyls, H2O bending vibrations and libration modes, and ¦ U-OH bending vibrations. Empirical relations were used for calculation of U-O bond lengths in uranyl R = f(○3 or ○1 (UO2)2+) Å. This was found in agreement with U-O bond lengths from the single crystal structure analysis. The number of observed bands supports the conclusion from single crystal structure analysis that at least two symmetrically distinct U6+ (in uranyl) and S6+ (in sulfate), and water molecules and hydroxyls may be present in the zippeite crystal structure. Some O-H…O bond lengths were attributed to the hydrogen-bonding network in zippeite crystal structure.

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ID Code: 1931
Item Type: Journal Article
Refereed: Yes
Additional Information: The use of uranium minerals to supply energy as electricity and as heat will increase in the coming decades. In Australia becuase of the lack of adequate water supply it has been proposed to use nuclear energy generation to desalintae water.
The basic and fundamnetal understanding of urnaium minerals is of vital environmental importance.
This manuscript serves to increase this knowledge.
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Keywords: zippeite, potassium uranyl sulfate mineral, joahnnite, uranophase, chemical formula, infrared and Raman spectroscopy, U, O bond length, O, H…O bond lengths
ISSN: 0077-7757
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Schweizerbart
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 02 Aug 2005 00:00
Last Modified: 29 Feb 2012 13:15

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