The Structure of Ferrihydrite, a Nanocrystalline Material

By F. M. Michel, L. Ehm, S. Antao, P. Lee, Peter J. Chupas, Gang Liu, D. Strongin, M. Schoonen, B. Phillips, J. Parise. Science, 2007

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Subfields: Geophysics

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Synthetic Coprecipitates of Exopolysaccharides and Ferrihydrite. Part I: Characterization (2008, background): “Past studies suggested that ferrihydrite contains between 0% and � 40% tetrahedral Fe ( Michel et al., 2007 ), corresponding to average Fe–O coordination numbers between 6 and 5.2.”
Graphene oxide: structural analysis and application as a highly transparent support for electron microscopy. (2009, background): “As a result, the mineral phase of the ferritin core has been the subject of considerable attention since the 1960s;(42) the dominant candidate being socalled “six-line” ferrihydrite.(45,46) In common with GO, there is a poor consensus on the crystal structure of ferrihydrite,(45) principally due to ”
Environmental magnetism: Principles and applications (2012, result): “…ferrihydrite indicated the presence of 20–30% tetrahedrally coordinated Fe3+ in the mineral structure [Maillot et al., 2011], which confirms recent hypotheses [e.g., Michel et al., 2007, 2010] but contradicts other studies [e.g., Drits et al., 1993; Jambor and Dutrizac, 1998; Manceau, 2009, 2011].”