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Raman spectroscopy of halotrichite from Jaroso, Spain

Frost, Ray L., Weier, Matt L., Kloprogge, J. Theo, & Rull, Fernando (2005) Raman spectroscopy of halotrichite from Jaroso, Spain. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 62(1-3), pp. 176-180.

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Abstract

Raman spectroscopy complimented with infrared ATR spectroscopy has been used to characterise a halotrichite FeSO4.Al2(SO4)3.22H2O from The Jaroso Ravine, Almeria, Spain. Halotrichites form a continuous solid solution series with pickingerite and chemical analysis shows that the jarosite contains 6% Mg2+. Halotrichite is characterised by four infrared bands at 3569.5, 3485.7, 3371.4 and 3239.0 cm-1. Using Libowitzky type relationships, hydrogen bond distances of 3.08, 2.876, 2.780 and 2.718 Å were determined. Two intense Raman bands are observed at 987.7 and 984.4 cm-1 and are assigned to the ν1 symmetric stretching vibrations of the sulphate bonded to the Fe2+ and the water units in the structure. Three sulphate bands are observed at 77 K at 1000.0, 991.3 and 985.0 cm-1 suggesting further differentiation of the sulphate units. Raman spectrum of the ○2 and ν4 region of halotrichite at 298 K shows two bands at 445.1 and 466.9 cm-1, and 624.2 and 605.5 cm-1 respectively confirming the reduction of symmetry of the sulphate in halotrichite.

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ID Code: 2334
Item Type: Journal Article
Keywords: sulphate, halotrichite, jarosite, Raman spectroscopy
DOI: 10.1016/j.saa.2004.12.023
ISSN: 1386-1425
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 19 Jul 2006
Last Modified: 29 Feb 2012 23:13

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