A Raman spectroscopic study of the uranyl phosphate mineral parsonsite
The mineral parsonsite with samples from The Ranger Uranium Mine, Australia and La Faye Mine, Grury, Saone-et-Loire, Burgundy, France has been characterised by Raman spectrocopy at 298 and 77 K and complemented with infrared spectroscopy. Two Raman bands close to 807 and 796 cm-1 are attributed to the ￮1 (UO2)2+ symmetric stretching modes, whilst two bands close to 953 or 945 cm-1 and 863-873 cm-1 are assigned to the ￮3 (UO2)2+ antisymmetric stretching vibrations. Four or five bands (953, 926, 910, 883 cm-1) are observed in the infrared spectrum in this region . Bands at 965-967 and 972 cm-1 are assigned to the ￮1 (PO4)3- symmetric stretching modes and bands that are observed in the 987 to 1078 cm-1 to the ￮3 (PO4)3- antisymmetric stretching modes. Bands at 465, 439, 406, 394 cm-1 (298 K) and 466, 442, 405, 395 cm-1 (77 K) are assigned to the split doubly degenerate ￮2 (PO4)-3 bending vibrations. Bands of very low intensity at 609, 595, 591, 582, 560 and 540 cm-1 are attributed to the split triply degenerate ￮4 (PO4)-3 bending modes. Bands observed at wavenumbers lower than 300 cm-1 are connected with the split ￮2 (￤) (UO2)2+ bending, ￮ (U-Oligand), ￤ (U-Oligand), and lattice vibrations. U-O bond lengths in uranyl are calculated frm the Raman and infrared spectra which are in agreement with those from available X-ray single crystal structure analysis of parsonsite. Short comment is given to the water content and possibility of a hydrogen bonding network in parsonsite crystal structure.
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|Item Type:||Journal Article|
|Additional Information:||This is one of a series of manuscripts on the Raman spectroscopic study of uranium minerals.|
|Keywords:||parsonite, threadgoldite, phosphate, Raman spectroscopy, U, O bond length, uranyl, molecular water|
|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:||06 Oct 2006 00:00|
|Last Modified:||29 Feb 2012 13:24|
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