Abstract
Spinel ceramics with different stoichiometry were synthesized from MgO and Al2O3 powders by means of hot pressing. These were neutron-irradiated up to 2.3×1024n/m2 (E > 0.1 MeV) at about 500°C. For all compositions, changes in macroscopic length, lattice parameter, Vickers hardness and thermal diffusivity were very small. The average macroscopic length change induced by irradiation increased slightly with increasing Al2O3 content, but the standard deviation was large, especially near the stoichiometric composition, and some specimens actually contracted. The correspondence of length change and lattice parameter change was excellent in near stoichiometric specimens, but slightly larger change in length occurred in Al2O3-rich specimens, indicating the presence of excess vacancies.
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