[en] Samples of eleven candidate ceramics (MgO. xAl₂O₃ in five forms, and Al₂O₃, Si₃N₄ and SiC in two forms each) have been sent to the EBR-II fission reactor for neutron irradiation testing. EBR-II is being used because of its high neutron flux and the absence of thermal neutrons which cause undesirable nuclear reactions with ¹⁴N. The four families of ceramics selected for inclusion have all shown acceptable performance in irradiation tests carried out by the LASL Ceramics Program or by others. The present study will in some cases yield results at temperatures not yet investigated, and in others will allow the evaluation of forms of these ceramics never before irradiated. Samples will be irradiated at 675 and 825 K to approx. 2.4 x 10²² n/cm² (E/sub n/ > 0.1 MeV), after which changes in electrical, mechanical, and thermal properties will be determined