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The effects of aqueous oxidation of (100)-oriented UO(2) single crystals have been studied by means of the Rutherford backscattering (RBS)/channeling technique. The O sublattice is analysed by using the (16)O((4)He, (4)He)(16)O resonance at 3045 keV. A strong flux-peaking effect is observed in angular scans recorded for different tilt planes across the [001] axis. Based on the assumption of the formation of a superstructure, a two-dimensional-split row model has been developed. In this model all oxygen rows are split according to a cross consisting of 5 rows and every second uranium row is split into 4 rows. Monte Carlo simulations of channeling data confirm the model and provide indications about lattice location of atoms.

Additional information

Authors: NOWICKI L ET AL, Soltan Institute for Nuclear Studies, Warsaw (PL);GARRIDO F ET AL, CNRS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay (FR);JAGIELSKI J, Institute of Electronic Materials Technology, Warsaw (PL);MATZKE H, JRC Karlsruhe (DE)
Bibliographic Reference: Article: Nuclear Instruments and Methods B (1997)
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