Abstract
Recent studies of the processes leading to oxygen atom displacement in Y(Eu)BaCuO and UO2 single crystals are reviewed. Radiation damage formation and its transformations were measured for UO2 single crystals. In order to improve the O-signal to U-background ratio use was made of the broad resonance of the 16O(α, α)16O scattering occurring at 7.6 MeV. Thus, it was possible to detect oxygen at almost the same counting rate as uranium. The uranium atom displacements produced by ion bombardment influence strongly ion channeling on both sublattices. In contrast O-atom displacements can only be detected by ion channeling on the O sublattice. 4He ion channeling and resonant scattering at 3.05 MeV were used to analyze Y(Eu)BaCuO single crystals and a- and c-axis oriented epitaxial layers. In contrast to UO2, oxygen atom displacements influence ion channeling along c-axis where mixed Cu-O rows appear. The anomalous increase in width and decreasing depth of angular scans for Cu and O were observed at temperatures below Tc. This was mainly attributed to a decrease of the total displacement amplitude of the apical oxygen by 3.5 pm. A much smaller decrease of the displacement amplitude in the order of 0.3 and 1.5 pm can also occur for the Cu and for other O atoms, respectively. The detailed analysis of the channeling results for both types of crystals was only possible using the Monte Carlo simulation method.
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