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Nucleation and Crystallization of Na 2 O · 2CaO · 3SiO 2 Glass by Differential Thermal Analysis
Author(s) -
Xu Xiaojie J.,
Ray Chandra S.,
Day Delbert E.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb04321.x
Subject(s) - nucleation , crystallization , differential thermal analysis , thermodynamics , activation energy , materials science , isothermal process , thermal analysis , crystal (programming language) , crystallography , chemistry , thermal , diffraction , physics , optics , computer science , programming language
The nucleation and crystallization of the Na 2 O · 2CaO · 3SiO 2 (NC 2 S 3 ) glass were studied by differential thermal analysis (DTA), and a (nucleation rate—temperature)‐like curve was determined by plotting either the reciprocal of the temperature corresponding to the crystallization peak maximum, 1/ T p , or the height of the crystallization peak, (δ T ) p , as a function of nucleation temperature, T n . The temperature where nucleation can occur for this glass ranges from 550° to 650°C and the temperature for maximum nucleation is 600°± 5°C. Both temperatures are in excellent agreement with those determined by the classical technique of nucleation followed by isothermal crystallization. The activation energy for crystallization, E c , for this glass is the same for surface and/or bulk crystallization, and is 370 ± 15 kJ/mol. The analysis of the crystallization data with the Kissinger equation yelds the correct value for E c only when crystal growth occurs on a fixed number of nuclei. When a majority of the nucleation occurs during the DTA measurements, a modified Kissinger equation must be used to calculate E c . E c is also independent of the heating rate when determined using a single‐crystallization‐peak analysis technique. The single‐peak analysis technique is useful for a rapid determination of E c or when only a small amount of sample is available.