Processing and Characterization of Nanocrystalline Mica Glass-Ceramics

In order to fabrication of transparent glass-ceramics with Li-mica nano crystals, the glasses with chemical composition of 94.9 mass% Li(i+X)Mg3AlSi3(i+X)F2 (x=0.5) with 5.1 mass% MgF2 were crystallized. The glasses were fabricated via the conventional melt-quenching technique. Mica crystals were precipitated in the glass phase by later heat treatment. Glass samples had glass transition temperature (Tg), 557 °C, softening temperature (Ts), 603 °C, and crystallization peak temperature (Tp), 655 °C. The fine mica crystals with size of < 50 nm were precipitated at 600 °C in one continuous glass phase of the binodal phase separation. Itʹs confirmed that both as-quenched and heat-treated samples are transparent in the visible wave length.