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