Thermo-Raman spectroscopic study of the uranium mineral sabugalite

Ray L. Frost, Matt L. Weier, Wayde N. Martens, J. Theo Kloprogge, J. Kristóf

Research output: Article

52 Citations (Scopus)

Abstract

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 (UO2)2+ stretching vibrations resulting from the non-equivalence of the uranyl bonds (UO2)2+. These bands give calculated U-O bond lengths of 1.773 and 1.780 Å. A low-intensity band is observed at 895 cm-1 assigned to the ν3 antisymmetric stretching vibration of (UO2)2+ units. Five bands are observed in the 950-1050 cm-1 region in the Raman spectrum of sabugalite and are assigned to the ν3 antisymmetric stretching vibration of (PO4)3- units. Changes in the Raman spectra reflect changes in the structure of sabugalite as dehydration occurs. No (PO4)3- symmetric stretching mode is observed. This result is attributed to the non-equivalence of the PO bonds in the PO4 units. The PO4 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.

Original languageEnglish
Pages (from-to)797-805
Number of pages9
JournalJournal of Raman Spectroscopy
Volume36
Issue number8
DOIs
Publication statusPublished - aug. 2005

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Uranium
Stretching
Minerals
Dehydration
Raman spectroscopy
Raman scattering
Bond length
Thermogravimetric analysis
Infrared spectroscopy

ASJC Scopus subject areas

  • Spectroscopy

Cite this

Thermo-Raman spectroscopic study of the uranium mineral sabugalite. / Frost, Ray L.; Weier, Matt L.; Martens, Wayde N.; Kloprogge, J. Theo; Kristóf, J.

In: Journal of Raman Spectroscopy, Vol. 36, No. 8, 08.2005, p. 797-805.

Research output: Article

Frost, Ray L. ; Weier, Matt L. ; Martens, Wayde N. ; Kloprogge, J. Theo ; Kristóf, J. / Thermo-Raman spectroscopic study of the uranium mineral sabugalite. In: Journal of Raman Spectroscopy. 2005 ; Vol. 36, No. 8. pp. 797-805.
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KW - Infrared spectroscopy

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