Differential Thermal Analysis of the Crystallization Kinetics in Perlite-Based Nanocrystalline Glass-Ceramics

A glass-ceramic material containing nanosized crystallites is synthesized based on the natural volcanic material perlite.Using the differential thermal analysis (DTA) method, the effect of Na 2 SiF 6 (a crystallization catalyst from the fluoride group) on the glass crystallization properties is studied.The characteristic glass-transition temperature T g , peak crystallization temperature T p , as well as the crystallization activation energy (E c ) and Avrami index (n) are determined in terms of the catalyst content in the initial composition.A decrease in the nucleation agent content is shown to increase T g , T p , and E c .The effect of the crystallization catalyst content on the crystallization mechanism and glass mechanical properties is discussed.