Patent ID: 7101819

Claim:
Amorphous material comprising Al 2 O 3 , ZrO 2 , and a metal oxide other than Al 2 O 3 or ZrO 2 , wherein the ZrO 2 is present in an amount of at least 15 precent by weight, based on the total weight of the amorphous material, wherein at least a portion of the metal oxide other than Al 2 O 3 or ZrO 2 forms a distinct crystalline phase if the amorphous material is crystallized, wherein the amorphous material comprises at least 50 percent by weight collectively of the Al 2 O 3 and the ZrO 2 , based on the total weight of the amorphous material, wherein the amorphous material contains not more than 20 percent by weight collectively As 2 O 3 , B 2 O 3 , GeO 2 , P 2 O 5 , SiO 2 , TeO 2 , and V 2 O 5 , based on the total weight of the amorphous material, wherein the amorphous material has x, y, and z dimensions each perpendicular to each other, and wherein each of the x, y, and z dimensions is at least 25 micrometers.