Patent ID: 6358869
Filing Date: 2002-03-19
Classification: C03C

Abstract:
An Li2Oâ€”Al2O3â€”SiO2 transparent crystallized glass with &bgr;-quartz solid solution precipitated as main crystals,wherein the Li+ concentration at a distance of 50 nm from the surface of the glass is at most 8/10 of the Li+ concentration at a distance of 2000 nm from the surface of the glass, wherein said Li2Oâ€”Al2O3â€”SiO2 transparent crystallized glass further contains Na2O, the Na+ concentration at a distance of 50 nm from the surface thereof is at least twice the Na+ concentration at a distance of 2000 nm from the surface of the glass, wherein said Li2Oâ€”Al2O3â€”SiO2 transparent crystallized glass further contains K2O, the K+ concentration at a distance of 50 nm from the surface thereof is at least one and a half times the K+ concentration at a distance of 2000 nm from the surface of the glass.