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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.


IMPACT FACTOR 2018: 1.339

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.333
Source Normalized Impact per Paper (SNIP) 2018: 0.720

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2193-3405
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Volume 97, Issue 8

Issues

Preparation and characterization of Zr-IV-containing Mg-Al-Cl layered double hydroxide

Hilde Curtius / Kristian Ufer
  • 1 Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen, Institut für Mineralogie und Lagerstättenlehre, Aachen, Deutschland
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/ Kathy Dardenne
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/ract.2009.1637

Abstract

In order to contribute to the long-term safety analysis of direct disposed research reactor fuel elements, the corrosion behavior of these fuel-types in final repository relevant salt brines was determined. Due to the corrosion processes, radionuclides were mobilized first, but then trapped by the formed secondary phases.

A Mg-Al layered double hydroxide (LDH) with chloride as interlayer anion was identified as one crystalline secondary phase component. The possibility to incorporate zirconium-IV into the lattice structure of the Mg-Al-Cl LDH was investigated by a co-precipitation process. The element zirconium was chosen because it has a low absorption cross section for neutrons, and is therefore used for nuclear energy applications, such as for cladding fuel elements. No zirconium release was detected, when the obtained LDH was treated with an ammonium carbonate solution. The molar stoichiometry with respect to Mg, Al and Zr remained stable and this is the first indication for the incorporation of zirconium.

For further examination, the material was analyzed by powder X-ray diffraction (XRD) combined with a Rietveld refinement. Due to a recursive calculation inside the Rietveld refinement, it was possible to derive structural parameters of the disordered LDH.

Further on, the Mg-Al-Zr-LDH was analyzed by EXAFS and the results did show that Zr is the central metal atom coordinated by 5 OH groups and by one chloride.

Keywords: Fuel elements; Secondary phases; Layered double hydroxides; Zirconium; Stacking faults

About the article

* Correspondence address: Forschungszentrum Jülich, IEF-6, Geb. 05.4, 52425 Jülich,


Published Online: 2009-09-25

Published in Print: 2009-08-01


Citation Information: Radiochimica Acta International journal for chemical aspects of nuclear science and technology, Volume 97, Issue 8, Pages 423–428, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2009.1637.

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