Intrinsic formation of nanocrystalline neptunium dioxide under neutral aqueous conditions relevant to deep geological repositories
- Husar, Richard
- Huebner, Rene
- Hennig, Christoph
- Martin, Philippe M.
- Chollet, Melanie
- Weiss, Stephan
- Stumpf, Thorsten
- Zaenker, Harald
- Ikeda-Ohno, Atsushi
DOIAbstract
International audienceThe dilution of aqueous neptunium carbonate complexes induces the intrinsic formation of nanocrystalline neptunium dioxide (NpO2) particles, which are characterised by UV/Vis and X-ray absorption spectroscopies and transmission electron microscopy. This new route of nanocrystalline NpO2 formation could be a potential scenario for the environmental transport of radionuclides from the waste repository (i.e. under near-field alkaline conditions) to the geological environment (i.e. under far-field neutral conditions
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