A Raman and infrared spectroscopic study of the uranyl silicates - weeksite, soddyite and haiweeite
Frost, Ray L., Cejka, Jiri, Weier, Matt L., Martens, Wayde N., & Kloprogge, J. Theo (2006) A Raman and infrared spectroscopic study of the uranyl silicates - weeksite, soddyite and haiweeite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 64(2), pp. 308-315.
Raman spectroscopy has been used to study the molecular structure of a series of selected uranyl silicate minerals including weeksite K2[(UO2)2(Si5O13)].H2O, soddyite [(UO2)2SiO4.2H2O] and haiweeite Ca[(UO2)2(Si5O12(OH)2](H2O)3 with UO22+/SiO2 molar ratio 2:1 or 2:5 .Raman spectra clearly show well resolved bands in the 750 to 800 cm-1 region and in the 950 to 1000 cm-1 region assigned to the ν1 modes of the (UO2)2+ units and to the (SiO4)4- tetrahedra. For example soddyite is characterised by Raman bands at 828.0, 808.6, 801.8 cm-1 (UO2)2+ (￮1), 909.6 and 898.0 cm-1 (UO2)2+ (￮3), 268.2 cm-1 and 257.8 and 246.9 cm-1are assigned to the ￮2 (￤) (UO2)2+. Coincidences of the ￮1 (UO2)2+ and the ￮1 (SiO4)4- is expected. Bands at 1082.2, 1071.2, 1036.3, 995.1, 966.3 cm-1 are attributed to the ￮3 (SiO4)4-.Sets of Raman bands in the 200 to 300 cm-1 region are assigned to ν2 δ (UO2)2+ and UO ligand vibrations. Multiple bands indicate the non-equivalence of the UO bonds and the lifting of the degeneracy of ν2 δ (UO2)2+ vibrations. The (SiO4)4- tetrahedral are characterized by bands in the 470 to 550 cm-1 and in the 390 to 420 cm-1 region. These bands are attributed to the ν4 and ν2 (SiO4)4- bending modes. The minerals show characteristic OH stretching bands in the 2900 to 3500 cm-1 and 3600 to 3700 cm-1.
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|Item Type:||Journal Article|
|Additional Information:||This paper is one of a large series of manuscripts on the study of the vibrational spectroscopy of secondary uranium minerals|
|Keywords:||uranyl silicate minerals, weeksite, haiweeite, soddyite, infrared and Raman spectroscopy|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)|
|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:||04 Oct 2007|
|Last Modified:||29 Feb 2012 23:24|
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