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Green rust (GR) as sodium sulphate form, NaFe(II) 6 Fe(III) 3 (OH) 18 (SO 4 ) 2  · 12H 2 O, is reacted with an aqueous solution of neptunyl ions (NpO 2  + ) and the resulting Np(IV) solid phase is investigated at a nanometer scale by different transmission electron microscopy (TEM) techniques, including high-resolution TEM (HRTEM), high-angle annular dark-field scanning TEM (HAADF-STEM), energy-dispersive X-ray spectroscopy (EDXS), and electron energy-loss spectroscopy (EELS). The aim of the analyses is to achieve insight into the potential immobilization mechanism for Np(V) in the context of safety assessment of a nuclear-waste repository. The neptunium is found to be immobilized at the edge of the green rust platelets, in a rim composed of nanocrystallites about 2–3.5 nm in size. The EELS results and more particularly the HRTEM findings are consistent with NpO 2  crystallizing in a fluorite-type structure. Furthermore, the Np-O 4,5  edges recorded by EELS at the Np(IV) phase are presented, expanding the EELS-data set currently available in the literature for Np.

TEM study of Green Rust Sodium Sulphate (GR Na,SO4 ) Interacted with Neptunyl Ions (NpO 2 + )