Patent ID: 7316986

Claim:
A glass-ceramic material, comprising a glass phase and a crystal phase, said crystal phase comprising gahnite crystals, or gahnite crystals and β-quartz-like solid solution, said glass ceramic-material comprising the following components, expressed in terms of mole percent: mole % SiO 2 63-75 Al 2 O 3 8-12.5 ZnO 6-10 Li 2 O 2-5 TiO 2 1-4 ZrO 2 0.5-3, wherein said crystal phase is doped with at least one dopant ion selected from the group consisting of: Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Ti, Co, U, Ni, Fe, V, and Er.