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Eu incorporation behavior of a Mg-Al-Cl layered double hydroxide

Published online by Cambridge University Press:  01 January 2024

Hilde Curtius  and
Kristian Ufer
Hilde Curtius*
Affiliation:
Institute of Energy Research (IEF), IEF-6: Safety Research and Reactor Technology, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
Kristian Ufer
Affiliation:
Institute of Energy Research (IEF), IEF-6: Safety Research and Reactor Technology, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
*
*E-mail address of corresponding author: h.curtius@fz-juelich.de
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Abstract

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From leaching experiments with metallic uranium-aluminum research reactor fuel elements in repository-relevant MgCl2-rich salt brines, a Mg-Al layered double hydroxide (LDH) with chloride as the interlayer anion was identified as a crystalline secondary phase component. The incorporation behavior of europium into the structure of the Mg-Al-Cl LDH was investigated. Synthesis via co-precipitation was performed. The Mg-Al-Eu-Cl LDH obtained was treated with a concentrated ammonium carbonate solution. No release of Eu was detected; hence the molar stoichiometry of the LDH remained stable with respect to Mg, Al and Eu. This chemical behavior might be the first indication of the incorporation of Eu.

The material was further examined by powder X-ray diffraction. Structural parameters were obtained from comparisons of simulated and experimental diffraction patterns of a CO32−${\rm{CO}}_3^{2 - }$-exchanged Mg-Al-Eu LDH and a Mg-Al LDH. The two materials showed different behaviors according to stacking order and lattice parameters. This is an indirect indication of the incorporation of Eu.

Keywords

EuropiumFuel ElementsIncorporationLDHSecondary PhasesStacking Faults
Type
Research Article
Information
Clays and Clay Minerals , Volume 55 , Issue 4 , August 2007 , pp. 354 - 360
Copyright
Copyright © 2007, The Clay Minerals Society

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