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A Raman spectroscopic study of M2+M3+ sulfate minerals, römerite Fe2+Fe23+ (SO4)4· 14H2O and botryogen Mg2+Fe3+ (SO4)2(OH)·7H2O

Frost, Ray L., Palmer, Sara J., Keeffe, Eloise C., Cejka, Jiri, Sejkora, Jiri , Plasil, Jakub , & Ivana, Jebava (2011) A Raman spectroscopic study of M2+M3+ sulfate minerals, römerite Fe2+Fe23+ (SO4)4· 14H2O and botryogen Mg2+Fe3+ (SO4)2(OH)·7H2O. Journal of Raman Spectroscopy, 42(4), pp. 825-830.

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Abstract

The mixed valency (M2+M3+) sulphate minerals, römerite Fe2+Fe23+(SO4)4•14H2O and botryogen Mg2+Fe3+(SO4)2(OH).7H2O have been studied by Raman spectroscopy. The Raman spectra of the two types of crystals proved very similar but not identical. The observation of two symmetric stretching modes confirmed the presence of the two non-equivalent sulphate units in the römerite structure. The observation of multiple bands in the antisymmetric stretching region and in the bending regions proves the symmetry of the sulphate anion is significantly reduced in the römerite structure. The number of Raman bands related to the (SO4)2- symmetric and antisymmetric vibrations support the X-ray single crystal structure conclusion that two symmetrically distinct S6+ are present in the structure of botryogen. Römerite is a mineral of environmental significance as it is commonly found in tailings and dumps.

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ID Code: 41367
Item Type: Journal Article
Additional Information: This is the result of International collaboratuion between QUT and The natural History Muiseum of Prague, Czech Republic
Keywords: römerite, botryogen, sulphates, Raman spectroscopy, molecular water, hydroxyl ions, hydrogen bonds O-H...O lengths
DOI: 10.1002/jrs.2782
ISSN: 0377-0486
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2010 John Wiley & Sons
Deposited On: 21 Apr 2011 07:35
Last Modified: 01 May 2012 00:10

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