Abstract
We investigated the crystallization kinetics of a 25CaO-25SrO-3.8B2O3-4TiO2-42.2SiO2 (mol%) silicate glass using differential scanning calorimetry (DSC). Considering the thermal inertia effect, we heated fine powder samples at different rates (2.5K/min – 20K/min) under non-isothermal conditions and analyzed the kinetic parameters through model-free and model-fitting approaches. We demonstrate that the activation energy of crystallization varied almost 23% with the crystalline fraction (α = 0.05 – 0.95) as well as the temperature. Nevertheless, we did not find significant changes in the average n values. We found that the Avrami-Erofeev model (n=2) describes the entire amorphous to crystalline transformation. Good agreement was reached between the experimental and reconstructed (α−T) curves. Further, we conclude that the crystallization of T4 glass for all α values is governed by the surface, with the crystal growth controlled by diffusion.
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