Journal
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume 13, Issue -, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2012GC004182
Keywords
XMCD; ferrihydrite; magnetic properties
Categories
Funding
- French Agence Nationale de la Recherche [ANR-2010-BLAN-604-01, ANR-06-JCJC-0144]
- National Science Foundation [EAR-0311869, 0346385, DGE-0114372]
- University of Minnesota
- SLS [20090237]
- ESRF [HE-3140]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0346385] Funding Source: National Science Foundation
- Agence Nationale de la Recherche (ANR) [ANR-06-JCJC-0144] Funding Source: Agence Nationale de la Recherche (ANR)
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Ferrihydrite is an important iron oxyhydroxide for earth and environmental sciences, biology, and technology. Nevertheless, its mineral structure remains a matter of debate. The stumbling block is whether a significant amount of tetrahedrally coordinated iron is present. Here we present the first X-ray magnetic circular dichroism (XMCD) measurements performed on a well characterized synthetic sample of 6-line ferrihydrite, at both K and L2,3 energy edges of iron. XMCD results demonstrate unambiguously the presence of tetrahedrally coordinated Fe(III) in the mineral structure, in quantities compatible with the latest extended X-ray absorption fine structure (EXAFS) analyses suggesting a concentration of 20-30%. Moreover, we find an antiferromagnetic coupling between tetrahedral and octahedral sublattices, with the octahedral sublattice parallel to the external magnetic field.
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