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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 217-220; DOI: 10.1180/minmag.2008.072.1.217
© 2008 Mineralogical Society of Great Britain and Ireland
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Session 2: Synchrotrons and environmental science

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

H. P. Vu*, S. Shaw and L. G. Benning

School of Earth and Environment, University of Leeds, LS2 9JT, UK

* E-mail: h.vu{at}see.leeds.ac.uk

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.






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