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A novel transparent Li2O-Al2O3-SiO2 glass-ceramic with micron-sized crystals
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DOI：10.1016/j.jnoncrysol.2026.124137.png)
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Abstract
En 中文
Transparent Li2O-Al2O3-SiO2 (LAS) glass-ceramics containing 0–9 mol% MgO and exhibiting micron-sized grains of the main crystalline phase, Li2Al2Si3O10, were prepared by partially substituting Li2O with MgO. The influence of MgO content on the crystallization behavior, microstructure, and physical properties of the glass-ceramics was investigated. For MgO content below 6 mol%, only the Li2Al2Si3O10 phase was found. At a content of 6 mol% MgO, a portion of Mg2+substituted for Li+at the crystal lattice sites, and this substitution was markedly enhanced when MgO content was increased to 9 mol%. The glass-ceramics containing 6 mol% MgO exhibited a crystal size of about 4.5 μm and a transmittance near 90%. Further increased MgO content to 9 mol%, glass-ceramics had larger crystals, reaching up to 6 μm, and displayed a maximum transmittance exceeding 80%. The coefficient of thermal expansion (CTE) of the glass-ceramics was lowest at 3 mol% MgO (1.74×10–6 K–1), which subsequently increased with higher MgO content, while the mechanical properties also improved. At 9 mol% MgO, the Vickers hardness and flexural strength of the glass-ceramics reached 7.68 GPa and 244.78 MPa, respectively.
Keywords:
Transparent glass-ceramics
Li2Al2Si3O10 phase
MgO substitution
Crystal size
Thermal expansion
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