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

Finck, N.; Radulescu, I.; Schild, D.; Rothmeier, M.; Huber, F.; Lützenkirchen, J.; Rabund, T.; Heberling, F.; Schlegel, M.L.; Dideriksen, K.; Nedel, S.; Geckeis, H.

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.


Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1088/1742-6596/712/1/012085
ISSN: 1742-6588, 1742-6596
URN: urn:nbn:de:swb:90-566205
KITopen ID: 1000056620
HGF-Programm 32.01.01; LK 01
Erschienen in Journal of physics / Conference Series
Band 712
Seiten 012085/1-5
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