Dimensional stability, optical and elastic properties of MgAl2O4 spinel irradiated in FFTF to very high exposures

摘要

Stoichiometric MgAl2O4 spinel specimens irradiated in FFTF-MOTA at temperatures between 385 and 750C to fluences ranging from 2.2 to 24.9 (times) 10(sup 22)n cm(sup (minus)2) (E>0.1 MeV) darken significantly, but do not develop any significant loss in weight or change in dimensions. Similar behavior was observed in both single crystal and fully dense polycrystalline specimens. Measurements of elastic constants by an ultrasonic technique show that no measurable changes occur as a result of the irradiation. These and other results confirm the stability of this material for fusion application as an electrical insulator.