Journal articles
X-ray magnetic circular dichroïsm provides strong evidence for tetrahedral iron in ferrihydrite
Abstract : [1] 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 dichroïsm (XMCD) measurements performed on a well characterized synthetic sample of 6-line fer-rihydrite, at both K and L 2,3 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 octa-hedral sublattice parallel to the external magnetic field. Components: 5100 words, 3 figures.
Cited literature [44 references]
https://hal-insu.archives-ouvertes.fr/insu-01311104
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Submitted on : Tuesday, May 3, 2016 - 4:39:58 PM
Last modification on : Thursday, July 1, 2021 - 3:17:19 AM
Long-term archiving on: : Tuesday, May 24, 2016 - 7:00:37 PM
Contributor : Eva Fareau Connect in order to contact the contributor
Submitted on : Tuesday, May 3, 2016 - 4:39:58 PM
Last modification on : Thursday, July 1, 2021 - 3:17:19 AM
Long-term archiving on: : Tuesday, May 24, 2016 - 7:00:37 PM
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