Patent ID: 6632758
Filing Date: 2003-10-14
Classification: C03C

Abstract:
A substantially transparent glass-ceramic whose composition lies within the SiO2â€”Ga2O3â€”Al2O3â€”K2Oâ€”Na2O system and containing an aluminogallate spinel crystal phase, the composition consisting essentially, in weight percent on an oxide basis, of 25-55% SiO2, 9-50% Ga2O3, 7-33% Al2O3, 0-20% K2O, 0-15% Na2O, 0-6 Li2O, 5-30% K2O+Na2O, the glass ceramic microstructure containing a crystal phase comprising at least 5%, by weight, of aluminogallate spinel crystals.