A comparison of the Raman spectra of natural and synthetic K and Na-jarosites at 298 and 77 K

Frost, Ray L., Wills, Rachael-Anne, Weier, Matt L., & Martens, Wayde N. (2005) A comparison of the Raman spectra of natural and synthetic K and Na-jarosites at 298 and 77 K. Journal of Raman Spectroscopy, 36(5), pp. 435-444.

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Raman spectroscopy at 298 and 77 K has been used to characterise synthetic and natural jarosites of formula Mn(Fe 3+)6(SO4)4(OH)12 where M is K or Na. The natural jarosites are characterised by a well define hydroxyl stretching pattern in contrast to that of the synthetic jarosites. This difference is attributed to differences in hydrogen bonding in the mineral. Multiple Raman OH stretching bands are indicative of non-equivalent OH units in the structure. Jarosites are characterised by an intense sharp band between 1007 and 1010 cm-1attributed to the sulphate symmetric stretching mode. The band width for K-jarosite is 4.4 cm-1 at 298 K and 3.6 cm-1 at 77 K in comparison to the values for synthetic jarosite of 10.0 (298 K) and 7.3 cm-1 (77 K). Differences in the spectra between the natural and synthetic jarosites are found. Reasons for these differences in the spectra are provided.

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ID Code: 3497
Item Type: Journal Article
Refereed: Yes
Keywords: jarosite, halotrichite, sulphate, natrojarosite, Raman spectroscopy
DOI: 10.1002/jrs.1317
ISSN: 0377-0486
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2005 John Wiley & Sons
Copyright Statement: The definite version is available on publication at www3.interscience.wiley.com
Deposited On: 08 Feb 2006 00:00
Last Modified: 29 Feb 2012 13:15

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