Transformation of ferrihydrite to hematite: an in situ investigation on the 
kinetics and mechanisms

Vu, H. P.; Shaw, S.; Benning, Liane G.

doi:10.1180/minmag.2008.072.1.217

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Transformation of ferrihydrite to hematite: an in situ investigation on the kinetics and mechanisms

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Vu, H. P.
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Shaw, S.
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Benning, Liane G.
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Vu, H. P., Shaw, S., Benning, L. G. (2008): Transformation of ferrihydrite to hematite: an in situ investigation on the kinetics and mechanisms. - Mineralogical Magazine, 72, 1, 217-220.
https://doi.org/10.1180/minmag.2008.072.1.217

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_806961

Abstract

The kinetics and mechanisms of the transformation of 2-line ferrihydrite (FH) to hematite (HM), in the presence of Pb at elevated temperatures and high pH condition, were elucidated using synchrotron-based, in situ energy dispersive X-ray diffraction (EDXRD). The time-resolved diffraction data indicated that HM crystallization occurred via a two-stage process. Based on the EDXRD data, combined with high-resolution electron microscopic images, an aqueous-aided 2D growth mechanism is proposed for both HM crystallization stages.