Glass ceramic and method of producing the same

摘要

A glass ceramic comprises (in wt.-% on oxide basis): SiO₂ 35 to 60, B₂O₃>4 to 10, P₂O₅ 0 to 10, Al₂O₃ 16.5 to 40, TiO₂ 1 to 10, Ta₂O₅ 0 to 8, Y₂O₃ 0 to 6, ZrO₂ 1 to 10, MgO 6 to 20, CaO 0 to 10, SrO 0 to 4, BaO 0 to 8, ZnO 0 to 4, SnO₂+CeO₂ 0 to 4, SO₄^2-+Cl^- 0 to 4, wherein the total content (SnO₂+CeO₂+SO₄^2-+Cl^-) is between 0.01 and 4 wt.-%. The glass ceramic may be processed by the float glass method, may be transparent and is, inter alia, suitable as a substrate for thin film semiconductors, in particular for display applications, solar cells etc.