Raman spectroscopy of uranyl rare earth carbonate kamotoite-(Y)
Frost, Ray L., Weier, Matt L., Cejka, Jiri, & Ayoko, Godwin A. (2006) Raman spectroscopy of uranyl rare earth carbonate kamotoite-(Y). Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 65(3-4), pp. 529-534.
Raman spectroscopy at 298 and 77K has been used to study the mineral kamotoite-(Y), a uranyl rare earth carbonate mineral of formula Y2(UO2)4(CO3)3(OH)8. 10-11H2O. The mineral is characterised by two Raman bands at 1130.9 cm-1 and 1124.6 cm-1 assigned to the ν1 symmetric stretching mode of the (CO3)2- units, while those at 1170.4 and 862.3 cm-1 (77 K) to the ￤ U-OH bending vibrations.. The assignment of the two bands at 814.7 and 809.6 cm-1 is difficult because of the potential overlap between the symmetric stretching modes of the (UO2)2+ units and the ν2 bending modes of the (CO3)2- units. Only a single band is observed in the 77 K spectrum at 811.6 cm-1. One possible assignment is that the band at 814.7 cm-1 is attributable to the ν1 symmetric stretching mode of the (UO2)2+ units and the second band at 809.6 cm-1 is due to the ν2 bending modes of the (CO3)2- units. Bands observed at 584 and 547.3 cm-1are attributed to water librational modes. An intense band at 417.7 cm-1 resolved into two components at 422.0 and 416.6 cm-1 in the 77 K spectrum is assigned to an Y2O2 stretching vibration. Bands at 336.3, 286.4 and 231.6 cm-1 are assigned to the ν2 (UO2)2+ bending modes. U-O bond lengths in uranyl are calculated from the wavenumbers of the uranyl symmetric stretching vibrations. The presence of symmetrically distinct uranyl and carbonate units in the crystal structure of kamotoite-(Y) is assumed. Hydrogen-bonding network related to the presence of water molecules and hydroxyls is shortly discussed.
Citation countsare sourced monthly fromand 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 theindexing service can be viewed at the linked Google Scholar™ search.
Full-text downloadsdisplays 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.
|Item Type:||Journal Article|
|Additional Information:||This is one of a series of papers on uranyl carbonates|
|Keywords:||kamotoite, mineral, uranyl, rare earth elements, carbonate, Raman spectroscopy|
|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 2006 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||23 Mar 2006|
|Last Modified:||29 Feb 2012 23:24|
Repository Staff Only: item control page