Glasses that are extremely difficult to crystallize are generally avoided in making glass‐ceramics. It is now possible to crystallize such glasses epitaxially using isostructural seeds. The role of solid‐state epitaxy in the crystallization of such albite (NaAlSi3O8) glass to glass‐ceramic was investigated. The glass was seeded with extremely fine ZrO2 (nonisostructural) and albite (isostructural) seed crystals. X‐ray diffraction results indicated that the albite‐seeded glass, heat‐treated at 1000°C for 100 h, epitaxially crystallized to albite, while the ZrO2 and unseeded glasses did not crystallize in identical heat‐treatment conditions. In addition, the albite‐seeded glass, heat‐treated at 905°C for 10 d, crystallized mostly to albite, whereas the ZrO2 and unseeded glasses at the same conditions contained only a small amount (<5 wt%) of nepheline (NaAlSiO4). The microstructure of the epitaxially grown glass‐ceramics showed that extremely fine crystals (∼0.2 μm thickness) were formed around the seed.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of the American Ceramic Society|
|State||Published - Jun 1991|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry