Abstract
Non-destructive ion beam analysis techniques have been employed to examine the radiation damage in MgAl 20 4 spinel single crystals irradiated with fast neutrons at 400 and 750°C to high fluences (≥ 5 × 10 22 n/cm 2, E n > 0.1 MeV). Rutherford backscattering and ion channeling measurements using 1–4 MeV He-ion beams revealed that the radiation damage saturated after irradiation at 400°C to 50 displacements per atom. The energy dependence of dechanneling indicated the dominant extended defects present in the highly irradiated spinel are in the form of dislocations. Channeling angular scans of particle induced X-ray emission further suggested that neutron irradiation tends to randomize cation distribution for Mg 2+ and Al 3+ cations on the lattice sites. These results are compared to the microstructure observations of Kinoshita et al. and the neutron scattering results of Sickafus et al.
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