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Thermo‐Raman spectroscopic study of the uranium mineral sabugalite
Author(s) -
Frost Ray L.,
Weier Matt L.,
Martens Wayde N.,
Kloprogge J. Theo,
Kristóf János
Publication year - 2005
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1366
Subject(s) - raman spectroscopy , uranyl , chemistry , dehydration , analytical chemistry (journal) , infrared , infrared spectroscopy , uranium , thermogravimetric analysis , antisymmetric relation , crystallography , materials science , physics , optics , organic chemistry , ion , biochemistry , metallurgy , mathematical physics
The changes in the structure of sabugalite were investigated using thermo‐Raman and infrared spectroscopy based on the results of thermogravimetric analysis. Two Raman bands are observed at 835 and 830 cm −1 assigned to the (UO 2 ) 2+ stretching vibrations resulting from the non‐equivalence of the uranyl bonds (UO 2 ) 2+ . These bands give calculated UO bond lengths of 1.773 and 1.780 Å. A low‐intensity band is observed at 895 cm −1 assigned to the ν 3 antisymmetric stretching vibration of (UO 2 ) 2+ units. Five bands are observed in the 950–1050 cm −1 region in the Raman spectrum of sabugalite and are assigned to the ν 3 antisymmetric stretching vibration of (PO 4 ) 3− units. Changes in the Raman spectra reflect changes in the structure of sabugalite as dehydration occurs. No (PO 4 ) 3− symmetric stretching mode is observed. This result is attributed to the non‐equivalence of the PO bonds in the PO 4 units. The PO 4 vibrations were not affected by dehydration. Thermo‐Raman spectroscopy proved to be a very powerful technique for the study of the changes in the structure of sabugalite during dehydration. Copyright © 2005 John Wiley & Sons, Ltd.