| abstract |
The disclosed embodiments relate to crystalline glass and glass ceramics that exhibit black color and are opaque. In one or more embodiments, the crystalline glass and glass ceramic comprise a precursor glass composition that exhibits a liquidus viscosity greater than about 20 kPa · sec. The glass-ceramic exhibits Fe 2 O 3 —TiO 2 —MgO-based, one or more crystalline phases of less than about 20 wt%, which can have a plurality of grains and an area fraction of less than about 15%. Examples of compositions used for crystalline glasses and glass ceramics are, in mole percent, SiO 2 in the range of about 50 to about 76, Al 2 O 3 in the range of about 4 to about 25, about 0 to about 14. P 2 O 5 + B 2 O 3 in the range, R 2 O in the range of about 2 to about 20, one or more nucleating agents in the range of about 0 to about 5, and in the range of about 0 to about 20. Including RO. |