XAS signatures of Am(III) adsorbed onto magnetite and maghemite

N. Finck; L. Radulescu; D. Schild; M. Rothmeier; F. Huber; J. Lützenkirchen; T. Rabung; F. Heberling; M. L. Schlegel; Knud Dideriksen; Sorin Nedel; H. Geckeis

doi:10.1088/1742-6596/712/1/012085

XAS signatures of Am(III) adsorbed onto magnetite and maghemite

N. Finck, L. Radulescu, D. Schild, M. Rothmeier, F. Huber, J. Lützenkirchen, T. Rabung, F. Heberling, M. L. Schlegel, Knud Dideriksen, Sorin Nedel, H. Geckeis

Department of Chemistry

4 Citations (Scopus)

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Abstract

Trivalent americium was adsorbed on magnetite and maghemite under similar chemical conditions and the local environment probed by EXAFS spectroscopy. In both samples, partially hydrated Am(III) binds the surface but slightly different surface complexes were identified. On Fe₃O₄, Am(III) forms monomeric tridentate surface complexes similar to that reported for Pu(III) at the (111) surface. In contrast, the lower number of detected Fe atoms may suggest that Am(III) forms monomeric bidentate surface complexes on γ-Fe₂O₃. Alternatively, the lower Fe coordination number can also be due to the presence of vacancies in maghemite. XPS data imply very similar binding environments for Am at both Fe oxide surfaces.

Original language	English
Article number	012085
Book series	Journal of Physics: Conference Series (Online)
Volume	712
Issue number	1
Number of pages	5
ISSN	1742-6596
DOIs	https://doi.org/10.1088/1742-6596/712/1/012085
Publication status	Published - 2016
Event	16th International Conference on X-ray Absorption Fine Structure - Karlsruhe, Germany Duration: 23 Aug 2015 → 28 Aug 2015 Conference number: 16

Conference

Conference	16th International Conference on X-ray Absorption Fine Structure
Number	16
Country/Territory	Germany
City	Karlsruhe
Period	23/08/2015 → 28/08/2015

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title = "XAS signatures of Am(III) adsorbed onto magnetite and maghemite",

abstract = "Trivalent americium was adsorbed on magnetite and maghemite under similar chemical conditions and the local environment probed by EXAFS spectroscopy. In both samples, partially hydrated Am(III) binds the surface but slightly different surface complexes were identified. On Fe3O4, Am(III) forms monomeric tridentate surface complexes similar to that reported for Pu(III) at the (111) surface. In contrast, the lower number of detected Fe atoms may suggest that Am(III) forms monomeric bidentate surface complexes on γ-Fe2O3. Alternatively, the lower Fe coordination number can also be due to the presence of vacancies in maghemite. XPS data imply very similar binding environments for Am at both Fe oxide surfaces.",

author = "N. Finck and L. Radulescu and D. Schild and M. Rothmeier and F. Huber and J. L{\"u}tzenkirchen and T. Rabung and F. Heberling and Schlegel, {M. L.} and Knud Dideriksen and Sorin Nedel and H. Geckeis",

year = "2016",

doi = "10.1088/1742-6596/712/1/012085",

language = "English",

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journal = "Journal of Physics: Conference Series",

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T1 - XAS signatures of Am(III) adsorbed onto magnetite and maghemite

AU - Finck, N.

AU - Radulescu, L.

AU - Schild, D.

AU - Rothmeier, M.

AU - Huber, F.

AU - Lützenkirchen, J.

AU - Rabung, T.

AU - Heberling, F.

AU - Schlegel, M. L.

AU - Dideriksen, Knud

AU - Nedel, Sorin

AU - Geckeis, H.

N1 - Conference code: 16

PY - 2016

Y1 - 2016

N2 - Trivalent americium was adsorbed on magnetite and maghemite under similar chemical conditions and the local environment probed by EXAFS spectroscopy. In both samples, partially hydrated Am(III) binds the surface but slightly different surface complexes were identified. On Fe3O4, Am(III) forms monomeric tridentate surface complexes similar to that reported for Pu(III) at the (111) surface. In contrast, the lower number of detected Fe atoms may suggest that Am(III) forms monomeric bidentate surface complexes on γ-Fe2O3. Alternatively, the lower Fe coordination number can also be due to the presence of vacancies in maghemite. XPS data imply very similar binding environments for Am at both Fe oxide surfaces.

AB - Trivalent americium was adsorbed on magnetite and maghemite under similar chemical conditions and the local environment probed by EXAFS spectroscopy. In both samples, partially hydrated Am(III) binds the surface but slightly different surface complexes were identified. On Fe3O4, Am(III) forms monomeric tridentate surface complexes similar to that reported for Pu(III) at the (111) surface. In contrast, the lower number of detected Fe atoms may suggest that Am(III) forms monomeric bidentate surface complexes on γ-Fe2O3. Alternatively, the lower Fe coordination number can also be due to the presence of vacancies in maghemite. XPS data imply very similar binding environments for Am at both Fe oxide surfaces.

U2 - 10.1088/1742-6596/712/1/012085

DO - 10.1088/1742-6596/712/1/012085

M3 - Conference article

AN - SCOPUS:84978719329

SN - 1742-6588

VL - 712

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 012085

T2 - 16th International Conference on X-ray Absorption Fine Structure

Y2 - 23 August 2015 through 28 August 2015

ER -

XAS signatures of Am(III) adsorbed onto magnetite and maghemite

Abstract

Conference

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