An infrared and Raman spectroscopic study of the uranyl micas

Frost, Ray L. (2004) An infrared and Raman spectroscopic study of the uranyl micas. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 60(7). pp. 1469-1480.

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DOI : 10.1016/j.saa.2003.08.013

Abstract

Vibrational spectroscopy using a combination of infrared and Raman spectroscopy has been used to study the uranyl micas also known as the autunite minerals, of general formula M(UO2)2(XO4)2.8-12H2O where M may be Ba, Ca, Cu, Fe2+, Mg, Mn2+ or ½(HAl) and X is As, or P. Included in these minerals are autunite, metautunite, torbernite, metatorbernite, metazeunerite, saléeite and sabugalite. Compared with the results of infrared spectroscopy, Raman microscopy shows excellent band separation enabling the separation and identification of bands attributed to (UO2)2+ units, PO4 and AsO4 units. Common to all spectra were bands at around 900 and 818 cm-1, attributed to the antisymmetric and symmetric stretching vibrations of the (UO2)2+ units. Water in autunites is in a highly structured arrangement in the interlayer of the uranyl micas. Water molecules are differentiated according to the strength of the hydrogen bonds formed between the water and the adjacent uranyl-phosphate or uranyl-arsenate surfaces and the hydration sphere of the interlayer cation.

ID Code:	801
Item Type:	Journal Article
Keywords :	autunite, metautunite, arsenate, phosphate, vanadate, Raman spectroscopy
ISSN:	1386-1425
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 Elsevier
Copyright Statement :	Reproduced in accordance with the copyright policy of the publisher: This journal is available online.
Deposited On:	10 Mar 2005
Last Modified:	03 Dec 2008 12:08

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