| http://www.w3.org/ns/prov#value | - One embodiment is a composite material comprising discrete crystalline regions within an amorphous (continuous) matrix, wherein the crystalline regions and the amorphous material each independently comprise at least 35 (in some embodiments, preferably at least 40, 45, 50, 55, 60, 65, or even at least 70) percent by weight Al2O3, based on the total weight of the crystalline regions and the amorphou
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