A Raman spectroscopic study of the uranyl selenite mineral haynesite
The mineral haynesite, a uranyl selenite, has been characterised by Raman spectroscopy at 298 and 77 K. Two bands at 811.5 and 800.2 cm-1 are assigned to the symmetric stretching modes of the (UO2)2+ and (SeO3)2- units respectively. These values give calculated U-O bond lengths of 1.799 and/or 1.801 Å. The broad band at 861.8 cm-1 is assigned to the ν3 antisymmetric stretching mode of the (UO2)2+ (calculated U-O bond length 1.813 Å). Additional bands are observed in the 77 K spectrum. In the spectroscopy of selenite compounds the position of the antisymmetric stretching vibration occurs at lower wavenumbers than the symmetric stretching mode and thus the band at 746.6 cm-1 is attributed to the ν3 antisymmetric stretching vibration of the (SeO3)2- units. The ν4 and the ν2 vibrational modes of the (SeO3)2- units are observed at 418.5 cm-1 and 472.1 cm-1. Bands observed at 278.3, 257.3 and 218.8 cm-1 are assigned to OUO bending vibrations.
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|Item Type:||Journal Article|
|Additional Information:||This is one of a series of papers on secondary uranium minerals. In this case the mineral haynesite which is a uranyl selenate. There are very few papers on selenates, let alone uranyl selenates.|
|Keywords:||selenite, Raman spectroscopy, U, O bond length, uranyl|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
|Copyright Owner:||Copyright 2006 John Wiley & Sons|
|Copyright Statement:||The definite version is available on publication at www3.interscience.wiley.com|
|Deposited On:||28 Sep 2006|
|Last Modified:||29 Feb 2012 13:24|
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