Abstract
The effect of various nuclei on crystallization mechanism of SiO 2–Al 2O 3–CaO–MgO(R 2O) glasses were investigated by differential thermal analysis (DTA) through Matusita, Marotta and modified Kissinger methods. The Avrami constant, n, and the activation energy for crystallization of the most promising specimens containing Cr 2O 3, Fe 2O 3 and TiO 2 in the single, double and triple nuclei series were determined. According to the results the Avrami constants derived from the Marotta method were more consistent with the other experimental observation. While glasses containing TiO 2 as the single nucleant represents surface crystallization and those containing Cr 2O 3 or Fe 2O 3 one-dimensional bulk crystallization, the crystallization mechanism of specimens containing both Cr 2O 3 and Fe 2O 3 and also the glasses containing the triple nuclei, are bulk and two dimensional.
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