Raman microscopy of autunite minerals at liquid nitrogen temperature

Frost, Ray L. & Weier, Matt L. (2004) Raman microscopy of autunite minerals at liquid nitrogen temperature. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 60(10), pp. 2399-2409.


View at publisher


Uranyl micas are based upon (UO2 PO4)- units in layered structures with hydrated counter cations between the interlayers. Uranyl micas also known as the autunite minerals are 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. The structures of these minerals have been studied using Raman microscopy at 298 and 77 K. Six hydroxyl stretching bands are observed of which three are highly polarised. The hydroxyl stretching vibrations are related to the strength of hydrogen bonding of the water OH units. Bands in the Raman spectrum of autunite at 998, 842 and 820 cm-1 are highly polarised. Low intensity band at 915 cm-1 is attributed to the ν3 antisymmetric stretching vibration of (UO2)2+ units. The band at 820 cm-1 is attributed to the ν1 symmetric stretching mode of the (UO2)2+ units. The (UO2)2+ bending modes are found at 295 and 222 cm-1. The presence of phosphate and arsenate anions and their isomorphic substitution are readily determined by Raman spectroscopy. The collection of Raman spectra at 77 K enables excellent band separation.

Impact and interest:

17 citations in Scopus
Search Google Scholar™
22 citations in Web of Science®

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

442 since deposited on 10 Mar 2005
25 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 809
Item Type: Journal Article
Refereed: Yes
Keywords: autunite, metautunite, arsenate, phosphate, vanadate, Raman spectroscopy
DOI: 10.1016/j.saa.2003.12.015
ISSN: 1386-1425
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
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 00:00
Last Modified: 29 Feb 2012 13:05

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page