X-ray magnetic circular dichrosm provides strong evidence for tetrahedral iron in ferrihydrite

Yohan Guyodo; Philippe Sainctavit; Marie Anne Arrio; Claire Carvallo; R. Lee Penn; Jasmine J. Erbs; Brady S. Forsberg; Guillaume Morin; Fabien Maillot; France Lagroix; Pierre Bonville; Fabrice Wilhelm; Andrei Rogalev

doi:10.1029/2012GC004182

X-ray magnetic circular dichrosm provides strong evidence for tetrahedral iron in ferrihydrite

Yohan Guyodo, Philippe Sainctavit, Marie Anne Arrio, Claire Carvallo, R. Lee Penn, Jasmine J. Erbs, Brady S. Forsberg, Guillaume Morin, Fabien Maillot, France Lagroix, Pierre Bonville, Fabrice Wilhelm, Andrei Rogalev

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

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 dichrosm (XMCD) measurements performed on a well characterized synthetic sample of 6-line ferrihydrite, 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 octahedral sublattice parallel to the external magnetic field.

Original language	English (US)
Article number	Q06Z44
Journal	Geochemistry, Geophysics, Geosystems
Volume	13
Issue number	6
DOIs	https://doi.org/10.1029/2012GC004182
State	Published - Jun 1 2012

Keywords

XMCD
ferrihydrite
magnetic properties

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10.1029/2012GC004182

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Guyodo, Y., Sainctavit, P., Arrio, M. A., Carvallo, C., Lee Penn, R., Erbs, J. J., Forsberg, B. S., Morin, G., Maillot, F., Lagroix, F., Bonville, P., Wilhelm, F., & Rogalev, A. (2012). X-ray magnetic circular dichrosm provides strong evidence for tetrahedral iron in ferrihydrite. Geochemistry, Geophysics, Geosystems, 13(6), Article Q06Z44. https://doi.org/10.1029/2012GC004182

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abstract = "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 dichrosm (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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T1 - X-ray magnetic circular dichrosm provides strong evidence for tetrahedral iron in ferrihydrite

AU - Guyodo, Yohan

AU - Sainctavit, Philippe

AU - Arrio, Marie Anne

AU - Carvallo, Claire

AU - Lee Penn, R.

AU - Erbs, Jasmine J.

AU - Forsberg, Brady S.

AU - Morin, Guillaume

AU - Maillot, Fabien

AU - Lagroix, France

AU - Bonville, Pierre

AU - Wilhelm, Fabrice

AU - Rogalev, Andrei

PY - 2012/6/1

Y1 - 2012/6/1

N2 - 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 dichrosm (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.

AB - 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 dichrosm (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.

KW - XMCD

KW - ferrihydrite

KW - magnetic properties

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X-ray magnetic circular dichrosm provides strong evidence for tetrahedral iron in ferrihydrite

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