Patent ID: 6316374
Filing Date: 2001-11-13
Classification: C03C,C04B

Abstract:
), K(75, 22, 3), L(85, 12, 3), and M(85, 14.5, 0.5) in the ternary diagram thereof and wherein said silicate glass further contains at least one member selected from the group consisting of Li.sub.2 O, Na.sub.2 O, MgO, CaO, SrO, BaO, ZnO, Al.sub.2 O.sub.3, La.sub.2 O.sub.3, Ta.sub.2 O.sub.5, Nd.sub.2 O.sub.3 and compounds thereof in an amount of 5 wt. % or less based on 100 wt. % of the entirety of said SiO.sub.2 and at least one of B.sub.2 O.sub.3 and K.sub.2, andwherein the compositional proportions of said three components based on wt. % represented by (glass, Si--Mg--Al--O ceramic, TiO.sub.2) fall inside a polygon formed by connecting points A""(100, 0, 0), B""(40, 60, 0), C""(30, 65, 5), D""(30, 50, 20), and E""(85, 0, 15) in the ternary diagram thereof.