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

Finck, N. ORCID iD icon 1; Radulescu, I.; Schild, D. ORCID iD icon 1; Rothmeier, M. 1; Huber, F. 1; Lützenkirchen, J. ORCID iD icon 1; Rabund, T.; Heberling, F. ORCID iD icon 1; Schlegel, M. L.; Dideriksen, K.; Nedel, S.; Geckeis, H. 1
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

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.

Volltext §
DOI: 10.5445/IR/1000056620
DOI: 10.1088/1742-6596/712/1/012085
Zitationen: 5
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1742-6588, 1742-6596
KITopen-ID: 1000056620
HGF-Programm 32.01.01 (POF III, LK 01) Grundl. Unters. - Geochemie v. Actiniden
Erschienen in Journal of physics / Conference Series
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 712
Seiten 012085/1-5
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