Effect of TiO 2 , LiF and Cr 2 O 3 in the Crystallization of Cristobalite and Tridymite in Sintered Glass-Ceramics

ISSN： 1876-990X

Source： Silicon, Vol.4, Iss.4, 2012-10, pp. : 281-287

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Abstract

Based on the poudretteite (K Na₂ B₃ Si₁₂ O₃₀) glass composition, six transparent glass frits were prepared. TiO₂, LiF and Cr₂O₃ were experimented on the base glass composition as nucleation catalysts. Only cristobalite and tridymite were developed through the sintering process of the glasses between 900 and 1100 °C. LiF enhances mainly tridymite with traces of cristobalite and in the opposite side the parent and both TiO₂ and Cr₂O₃ containing glasses catalyzed mainly cristobalite with traces of tridymite. The microstructure of the glass samples heat-treated at 1000 °C showed backbone-like, small rods, quadrant-, hexagonal crystals referred to the cristobalite and tridymite. The EDS microanalysis shows the presence of both alkalis, i.e. Na⁺ and K⁺, in the cristobalite crystal structure while the residual glass contains K⁺. The infrared spectroscopy indicates the band patterns of cristobalite and tridymite.