Transformation of ferrihydrite to hematite: anin situinvestigation on the kinetics and mechanisms
- 1 February 2008
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 72 (1), 217-220
- https://doi.org/10.1180/minmag.2008.072.1.217
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 situenergy 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.Keywords
This publication has 11 references indexed in Scilit:
- The kinetics and mechanisms of schwertmannite transformation to goethite and hematite under alkaline conditionsAmerican Mineralogist: Journal of Earth and Planetary Materials, 2008
- The kinetics and mechanisms of goethite and hematite crystallization under alkaline conditions, and in the presence of phosphateAmerican Mineralogist: Journal of Earth and Planetary Materials, 2005
- The Iron OxidesPublished by Wiley ,2003
- Thermally Induced Release of Adsorbed Pb upon Aging Ferrihydrite and Soil OxidesEnvironmental Science & Technology, 1999
- Oxygen isotope fractionation in ferric oxide-water systems: low temperature synthesisGeochimica et Cosmochimica Acta, 1999
- Influence of sorbate-sorbent interactions on the crystallization kinetics of nickel- and lead-ferrihydrite coprecipitatesGeochimica et Cosmochimica Acta, 1999
- Kinetic Theory in the Earth SciencesPublished by Walter de Gruyter GmbH ,1998
- Effect of pH on the Formation of Goethite and Hematite from FerrihydriteClays and Clay Minerals, 1983
- The Formation of Hematite from Amorphous Iron(III)HydroxideClays and Clay Minerals, 1975
- Kinetics of Phase Change. II Transformation-Time Relations for Random Distribution of NucleiThe Journal of Chemical Physics, 1940