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Abstract
A high-resolution electron microscopy study has been carried out on a sintered β-Si3N4 specimen which had been neutron irradiated to a dose of 2.8 × 1026 neutrons m−2 (E > 0.1 MeV) at 793 K in the experimental fast reactor JOYO. The Burgers vector of the neutron-induced interstitial dislocation loops was found to be about (1/18)〈2429〉 (=⅙〈023〉), corresponding to an extra layer of SiN4 tetrahedra inserted into the {1010} planes. Based on image simulation and crystal chemical considerations, a suitable structural model for the observed defects has been deduced.