Raman spectroscopic detection of wyartite in the presence of rabejacite

Frost, Ray L. and Henry, Dermot A. and Erickson, Kristy L. (2004) Raman spectroscopic detection of wyartite in the presence of rabejacite. Journal of Raman Spectroscopy, 35(4). pp. 255-260.

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DOI : 10.1002/jrs.1144

Abstract

Raman microscopy has been used to affirm the presence of wyartite CaU5+(UO2)2(CO3)O4(OH)(H2O)7 in the presence of rabejacite (Ca(UO2)4(SO4)2(OH)5.6H2O) obtained from the Ranger Mine, Northern Territory, Australia. This occurrence is somewhat unusual in that it means that a uranyl carbonate has been formed under acid conditions. Wyartite is a mineral known for the occurrence of pentavalent U5+. 1 A band is observed at 818 cm-1 in the Raman spectrum of wyartite assigned to the ν2 symmetric bending mode of the (CO3)2- units. The presence of carbonate is confirmed by the ν1 stretching vibration at 1071 cm-1 and the ν3 stretching vibrations at 1445 and 1345 cm-1. Two bands are observed at 853 and 837 cm-1 and are assigned to the ν1 stretching modes of the UO2 units. Raman spectroscopy enables the partial band separation of the ν2 (CO3)2- and ν1 modes of UO2. The Raman spectrum of rabejacite is characterised by an intense sharp band at 1010 cm-1 assigned to the ν1 stretching mode of (SO4)2- . Three bands observed at 1086, 1123 and 1175 cm-1 are attributed to the ν3 antisymmetric stretching modes of (SO4)2-. The mineral rabejacite is also characterised by ν2 bending modes at 457 and 394 cm-1 and ν4 bending modes at 666, 605, 537 and 505 cm-1. Raman spectroscopy has proven most useful for the detection of wyartite in the presence of other mineral phases.

ID Code:	817
Item Type:	Journal Article
Additional Information :	For more information, please refer to the journal's website (see hypertext link) or contact the author. Note: Co-author, Dermot Henry is affiliated with Museum Victoria (Geosciences), Melbourne.
Keywords :	rabejacite, wyartite, dehydration, johannite, Raman spectroscopy, infrared spectroscopy
ISSN:	0377-0486
Subjects:	Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions:	QUT Faculties and Divisions > Faculty of Science
Copyright Owner :	Copyright 2004 John Wiley & Sons
Deposited On:	25 Oct 2005
Last Modified:	03 Dec 2008 12:09

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