Raman spectroscopic detection of wyartite in the presence of rabejacite
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.
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|Item Type:||Journal Article|
|Keywords:||rabejacite, wyartite, dehydration, johannite, Raman spectroscopy, infrared 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|
Past > Schools > School of Physical & Chemical Sciences
|Copyright Owner:||Copyright 2004 John Wiley & Sons|
|Copyright Statement:||The definite version is available on publication at www3.interscience.wiley.com|
|Deposited On:||25 Oct 2005|
|Last Modified:||29 Feb 2012 23:05|
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