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On a phase transformation produced by mechanical activation in iron pyrite

Published online by Cambridge University Press:  15 February 1999

J.-P. Eymery
J.-P. Eymery*
Affiliation:
Laboratoire de Métallurgie Physique (UMR 6630 CNRS), Université de Poitiers, bâtiment SP2MI, boulevard 3, Téléport 2, B.P. 179, 86960 Futuroscope Cedex, France
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Abstract

The behaviour of pyrite in the process of mechanical milling in air has been examined. Milled powders were characterized by scanning electron microscopy, Mössbauer spectroscopy working in transmission geometry and X-ray diffraction. In the presence of oxygen, pyrite can readily be transformed to ferrous sulphate monohydrate, which indicates that the Fe(II) goes from a low-spin state to to a high-spin state. The transformation mechanism is saturated after about 60 hours milling, but however it can be markedly prolonged by further ageing at room temperature. The results also indicate that mechanical milling is a useful room temperature process of material production.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 5 , Issue 2 , February 1999 , pp. 115 - 121
Copyright
© EDP Sciences, 1999

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