Abstract
Ion-irradiation was observed to transform MgAl2O4 spinel first to a metastable crystalline phase and then to an amorphous phase at cryogenic temperatures. Elastic stiffening of 15% occurred upon formation of the metastable crystalline phase. A second transformation from the metastable crystalline spinel to an amorphous state was accompanied by elastic softening of 25% relative to unirradiated spinel. This phase transformation behavior in spinel appears to be different from that in intermetallic compounds where only elastic softening associated with radiation damage accumulation is observed. A two-stage radiation damage model is proposed to explain the observed phase transformations.
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Yu, N., Devanathan, R., Sickafus, K.E. et al. Radiation-induced phase transformations in MgAl2O4 spinel. Journal of Materials Research 12, 1766–1770 (1997). https://doi.org/10.1557/JMR.1997.0243
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DOI: https://doi.org/10.1557/JMR.1997.0243