Anomalous Avrami index recorded during the non-isothermal crystallization of borotitanosilicate glass powders
Source abstract
Abstract
We investigated the crystallization kinetics of 24.5CaO-24.5SrO-3.7B 2O 3-6TiO 2-41.3SiO 2 and 25CaO-25SrO-3.8B 2O 3-8TiO 2-42.2SiO 2 (mol%) borotitanosilicate glass powders (≤ 43µm), herein referred as T6 and T8, respectively, using differential scanning calorimetry (DSC - β = 2.5°C/min – 40°C/min) and scanning electron microscopy (SEM). The kinetic parameters were calculated through model-free and model-fitting approaches. Despite minor variations in the corresponding activation energy, it was found that the local Avrami exponents changed significantly, and multiple-step reactions govern the crystallization process (with n ≥ 2 for 0.05 ≤ α ≤ 0.95). These unexpected n values were attributed to the complexity of the crystallization process, where crystals grow individually and three-dimensionally in the early stages, thereafter tending to grow in a single direction (1D) after meeting each other.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Thermal and Kinetic Analysis · Glass properties and applications · Zeolite Catalysis and Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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