NIR spectroscopy of jarosites

Frost, Ray L., Wills, Rachael-Anne, Weier, Matt L., & Martens, Wayde N. (2005) NIR spectroscopy of jarosites. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 62(4-5), pp. 869-874.

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Abstract

Near-infrared spectroscopy (NIR) has been used to analyse a suite of synthesised jarosites of formula Mn(Fe 3+)6(SO4)4(OH)12 where M is K, Na, Ag, Pb, NH4+ and H3O+. Whilst the spectra of the jarosites show a common pattern differences in the spectra are observed which enable the minerals to be distinguished. The NIR bands in the 6300 to 7000 cm-1 region are attributed to the first fundamental overtone of the infrared and Raman hydroxyl stretching vibrations. The NIR spectrum of the ammonium jarosite shows additional bands at 6460 and 6143 cm-1 attributed to the first fundamental overtones of NH stretching vibrations. A set of bands are observed in the 4700 to 5500 cm-1 region which are assigned to combination bands of the hydroxyl stretching and deformation vibrations. The ammonium jarosite shows additional bands at 4730 and 4621 cm-1attributed to the combination of NH stretching and bending vibrations. NIR spectroscopy has the ability to distinguish between the jarosite minerals even when the formula of the minerals is closely related. The NIR spectroscopic technique has great potential as a mineral exploratory tool on planets and in particular Mars.

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ID Code: 2762
Item Type: Journal Article
Refereed: Yes
Additional Information: The discovery on Mars of minerals such as jarosites has significant importance for the detection of water on Mars. It is important to have methods for the identification of minerals. NIR spectroscopy is one of these methods. It is the most valuable tool for remote identification of minerals such as jarosites.
Keywords: iron sulphates, natrojarosite, jarosite, plumbojarosite, argentojarosite, near, IR spectroscopy
DOI: 10.1016/j.saa.2005.03.018
ISSN: 1386-1425
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
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: 02 Dec 2005 00:00
Last Modified: 29 Feb 2012 13:12

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