abstract |
The glass-ceramic material of the present invention has the hexagonal sheet structure of hexacelsian as its primary crystal phase and exhibits x-ray diffraction patterns indicative of hexacelsian, said glass-ceramic material has a stabilized thermal expansion and an overall weight percent composition comprising: 35-55% SiO2, 5-25% Al2O3, 5-25% MgO, 5-35% BaO, 6-14% TiO2, 0-10% ZnO, and 0-8% ZrO2. |