Thermal decomposition of ammonium jarosite (NH4)Fe3(SO4)2(OH)6

Frost, Ray L., Wills, Rachael-Anne, Kloprogge, J. Theo, & Martens, Wayde N. (2006) Thermal decomposition of ammonium jarosite (NH4)Fe3(SO4)2(OH)6. Journal of Thermal Analysis and Calorimetry, 84(2), pp. 489-496.

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Abstract

Thermogravimetry combined with mass spectrometry has been used to study the thermal decomposition of a synthetic ammonium jarosite. Five mass loss steps are observed at 120, 260, 389, 510 and 541 degrees Celsius. Mass spectrometry through evolved gases confirms these steps as loss of water, dehydroxylation, loss of ammonia and loss of sulphate in two steps. Changes in the molecular structure of the ammonium jarosite were followed by infrared emission spectroscopy (IES). This technique allows the infrared spectrum at the elevated temperatures to be obtained. IES confirms the dehydroxylation to have taken place by 300 degrees Celsius and the ammonia loss by 450 degrees Celsius. Loss of the sulphate is observed by changes in band position and intensity after 500 degrees Celsius.

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ID Code: 4253
Item Type: Journal Article
Refereed: Yes
Additional Information: In recent times, minerals such as the jarosites have been found on planet Mars. Such minerals are only formed from aqueous solution. Thus the presence of these minerals is proof of the presence of water on mars either presently or more likely in the past. The temperature fluctuations on Mars can be very large, and high temperatures can be reached. This paper is one of a series of papers which elucidates the stablity of jarosites.
Keywords: ammonium jarosite, dehydroxylation, infrared emission spectroscopy, thermogravimetric analysis
DOI: 10.1007/s10973-005-6953-8
ISSN: 1572-8943
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Springer
Copyright Statement: The original publication is available at SpringerLink
http://www.springerlink.com
Deposited On: 23 May 2006 00:00
Last Modified: 29 Feb 2012 13:23

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