Thermo-Raman spectroscopic study of the uranium mineral sabugalite

Frost, Ray L., Weier, Matt L., Martens, Wayde N., Kristof, Janos, & Kloprogge, J. Theo (2005) Thermo-Raman spectroscopic study of the uranium mineral sabugalite. Journal of Raman Spectroscopy, 36(8), pp. 797-805.

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Abstract

The changes in the structure of sabugalite have been undertaken using thermo-Raman and infrared spectroscopy based upon the results of thermogravimetric analysis. Two Raman bands are observed at 835 and 830 cm-1 assigned to the (UO2)2+ stretching vibrations resulting from the non-equivalence of the uranyl bonds (UO2)2+. These bands give calculated U-O bond lengths of 1.773 and 1.7808 Å. A low intensity band is observed at 895 cm-1 assigned to the ν3 antisymmetric stretching vibration of (UO2)2+ units. Five bands are observed in the 950 to 1050 cm-1 region in the Raman spectrum of sabugalite and are assigned to the ν3 antisymmetric stretching vibration of (PO4)3- units. Changes in the Raman spectra reflect changes in the structure of sabugalite as dehydration occurs. No (PO4)3- symmetric stretching mode is observed. This result is attributed to the non-equivalence of the PO bonds in the PO4 units. The PO4 vibrations were not affected by dehydration. Thermo-Raman spectroscopy proved to be a very powerful technique for the study of the changes in the structure of sabugalite during dehydration.

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ID Code: 2059
Item Type: Journal Article
Refereed: Yes
Keywords: autunite, sabugalite, phosphate, dehydration, Raman spectroscopy, infrared spectroscopy
DOI: 10.1002/jrs.1366
ISSN: 0377-0486
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2005 John Wiley & Sons
Copyright Statement: The definite version is available on publication at www3.interscience.wiley.com
Deposited On: 08 Sep 2005 00:00
Last Modified: 29 Feb 2012 13:14

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