Corning Incorporated
YTTRIA-CONTAINING GLASS SUBSTRATE

Abstract:

A glass substrate includes about 45 mol % to about 70 mol % SiO.sub.2, about 15 mol % to about 30 mol % Al.sub.2O.sub.3, about 7 mol % to about 20 mol % of Y.sub.2O.sub.3, and optionally 0 mol % to about 9 mol % of La.sub.2O.sub.3. The glass substrate has high modulus and fracture toughness.