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Four kinds of silicon nitride-related ceramics were neutron irradiated up to 8.5 × 1024 n/m2 (E > 0.1 MeV) at 563 K. Induced swelling were almost recovered by thermal annealing up to 1473 K. Microstructure of the as-irradiated silicon nitride-based ceramics and those of after thermal annealing up to 1123, 1223 and 1473 K were observed with a high-resolution transmission electron microscope (HREM)...
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