Determining crystallization kinetic parameters of Li2O–Al2O3–SiO2 glass from derivative differential thermal analysis curves |
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Authors: | Kangguo Cheng |
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Affiliation: | Department of Materials Science and Engineering and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA |
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Abstract: | The kinetic parameters such as crystallization activation energy, E, and the frequency factor, ν, of Li2O–Al2O3–SiO2 glass were determined by a new non-isothermal method. The method is described by the equation , where β is the heating rate and Tf is the inflection-point temperature of differential thermal analysis (DTA). The value of Tf is determined as the maximum peak temperature on derivative differential thermal analysis (DDTA) curves. Values of E and ν of Li2O–Al2O3–SiO2 glass were also determined by two existing non-isothermal methods, namely the Kissinger plot and the Ozawa plot, and compared with those determined by isothermal method. Values of E and ν determined by the proposed equation were 332 kJ/mol and 1.4×1013 s?1, respectively. They are excellent agreement with the isothermal analysis results, 336 kJ/mol and 1.8×1013 s?1, respectively. In contrast, both the Kissinger equation and the Ozawa equation give much higher values of E and ν. |
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Keywords: | Crystallization DDTA Kinetics Li2O–Al2O3–SiO2 glass Thermal analysis |
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