Utilization of DTA in the Determination of a Crystallization Mechanism in Transparent Glass-Ceramics with a Nanocrystalline Structure

作者：Ghasemzadeh M^*; Nemati A; Golikand A Nozad; Hamnabard Z; Baghshahi S

来源：Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry, 2011, 41(5): 561-570.

DOI：10.1080/15533174.2011.568442

• activation energies
• crystallization kinetics
• glass ceramics
• microstructure

Non-isothermal differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to study the nucleation and crystallization behavior of mica glass-ceramics with LiF as nucleating agent. The models enabled establishing the kinetic parameters for crystal growth of individual phases. The activation energies for crystal growth were found to be in the range of 161-301 KJ/mol, 416-424 KJ/mol, and 583-1011 KJ/mol for base glasses, samples with substitution of Li2O for K2O and samples with addition of LiF, respectively. Formation of transparent glass-ceramics from studied glass-samples has been investigated. Transparency is assumed to occur in the samples with nanocrystalline structure.