Study of a mechanochemical transformation in iron pyrite

The observation of a phase transformation from pyrite FeS 2 (Fe 2+ in a low-spin state) to szomolnokite FeSO 4·H 2O (Fe 2+ in a high-spin state) by the mechanical action of ball-milling in air is reported. 57Fe Mössbauer spectroscopy, X-ray diffraction and scanning electron microscopy were used to i...

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Bibliographic Details
Published in:Journal of alloys and compounds 2000-02, Vol.298 (1), p.306-309
Main Authors: Eymery, J.P, Ylli, F
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Iron sulphide
Mechanical milling
Mineralogy
Mössbauer spectroscopy
Non silicates
Phase transformation
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Summary:The observation of a phase transformation from pyrite FeS 2 (Fe 2+ in a low-spin state) to szomolnokite FeSO 4·H 2O (Fe 2+ in a high-spin state) by the mechanical action of ball-milling in air is reported. 57Fe Mössbauer spectroscopy, X-ray diffraction and scanning electron microscopy were used to identify changes produced by mechanical activation. The pyrite structure can be sufficiently destabilized locally in the core of the powder particles, so that it may partly transform into szomolnokite during the milling process itself. After a long relaxation period in ambient air following sample grinding, the transformation process is shown to extend to the grain periphery without further mechanical activation.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(99)00659-3