Abstract
Metastable solid solutions with the β‐quartz structure can be crystallized from most glasses in the system SiO2‐Mg(AlO2)2‐LiAlO2 as well as from many containing the additional components Zn(AlO2)2 Al(AlO2)3, Li2ZnO2, and Li2BeO2. Internal nucleation is afforded by additions of ZrO2 or TiO2. Either transparent or opaque crystalline materials can be formed from glasses containing about 70% SiO2. The transparency is due to a combination of low birefringence in the major stuffed β‐quartz phase and minute crystal size. Thermal expansions vary from ‐20 to +50 × 10−7/°C. Thermal stability is highly variable. Breakdown products include spinel, cordierite, β‐spodumene, willemite, mullite, and cristobalite. Magnesian compositions can be strengthened by a 2Li+⇌ Mg2+ ionexchange reaction. Abraded flexural strengths range from 30,000 to 160,000 psi.
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