| http://www.w3.org/ns/prov#value | - heat-treating amorphous material such that at least a portion of the amorphous material is converted to a glass-ceramic, wherein the amorphous material comprises Al2O3, ZrO2, and a metal oxide other than Al2O3 or ZrO2, wherein at least a portion of the metal oxide other than Al2O3 or ZrO2 forms a distinct crystalline phase during the heat-treating, wherein the amorphous material comprises at least
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