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- Title
Thermal decomposition of ammonium jarosite (NH<sub>4</sub>)Fe<sub>3</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>.
- Authors
Frost, Ray L.; Wills, Rachael-Anne; Kloprogge, J. Theo; Martens, Wayde
- 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°C. 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°C and the ammonia loss by 450°C. Loss of the sulphate is observed by changes in band position and intensity after 500°C.
- Subjects
THERMOGRAVIMETRY; MASS spectrometry; AMMONIUM; JAROSITE; EMISSION spectroscopy
- Publication
Journal of Thermal Analysis & Calorimetry, 2006, Vol 84, Issue 2, p489
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-005-6953-8