Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 725, Issue -, Pages 792-799Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.07.191
Keywords
Yttrium aluminium garnet; Amorphous of Y3Al5O12; Sol-gel processes (Pechini method); Crystallization kinetics; DSC
Categories
Funding
- European Regional Development Fund [262 201 20056]
- [APVV 0014-15]
- [SAS-MOST JRP 2015/6]
- [VEGA 2/0026/17]
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Crystallization of glass prepared by flame technique from a crystalline YAG precursor synthesized by Pechini method was studied under noneisothermal conditions by differential scanning calorimetry. The crystallization peaks were mathematically deconvoluted into two peaks representing two overlapping thermal effects. These two peaks were examined in terms of the nucleationegrowth Johnson-Mehl -Avrami model, autocatalytic Sestak - Berggren model and Malek z(alpha) and y(alpha) functions. At lower heating rates, the only process in the system was volume crystallization with the apparent activation energy of 555 +/- 37 kJ* mol(-1).At higher heating rates, partial change of crystallization mechanism was observed with significant contribution of surface crystallization and the activation energy of 606 +/- 31 kJ* mol(-1) (C) 2017 Elsevier B.V. All rights reserved.
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