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Contrary to the moderate ballistic advantage of Al 2 O 3 ceramics over MgAl 2 O 4 polycrystals, the present study shows a reverse ratio of the ballistic strength of alumina and spinel single crystals : Spinel single crystals outperform sapphire and exhibit a similarly high stability as submicrometer Al 2 O 3 ceramics. The results correlate with different cleavage of single crystalline spinel and sapphire, changing the fragmentation on ballistic impact.
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Krell et al. (2013) studied this question.
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