Raman microscopy of selected autunite minerals
Raman spectroscopy at ambient and liquid nitrogen temperature has been used to determine the molecular structure of selected minerals from the autunite and meta-autunite groups. Six hydroxyl stretching bands for autunite are observed of which three are highly polarised. The hydroxyl stretching vibrations are related to the strength of hydrogen bonding of the water 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 3 antisymmetric stretching vibration of (UO2)2+ units. The band at 820 cm–1 is attributed to the 1 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.
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|Item Type:||Journal Article|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2004 E. Schweizerbart'sche Verlagsbuchhandlung|
|Deposited On:||17 Jun 2009 12:56|
|Last Modified:||12 Mar 2012 10:58|
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