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Crystallization Kinetics and Mechanism of Low‐Expansion Lithium Aluminosilicate Glass‐Ceramics by Dilatometry
Author(s) -
Karmakar Basudeb,
Kundu Paritosh,
Jana Sunirmal,
Dwivedi Ravindra Nath
Publication year - 2002
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.1151-2916.2002.tb00498.x
Subject(s) - dilatometer , aluminosilicate , activation energy , crystallization , materials science , thermodynamics , lithium (medication) , glass ceramic , diffusion , avrami equation , kinetics , chemical engineering , mineralogy , arrhenius equation , ceramic , thermal expansion , chemistry , composite material , catalysis , medicine , biochemistry , physics , quantum mechanics , engineering , endocrinology
The crystallization kinetics and mechanism of a precursor glass of lithium aluminosilicate (LAS)‐based commercial low‐expansion glass‐ceramics were investigated using a dilatometer. The isothermal crystallization behavior of β‐quartz solid solution (ss) was found to obey the Avrami equation. Nonisothermal crystallization data were analyzed by the Ozawa method and modified Kissinger equation. The value of the Avrami exponent ( n ) was ∼1.5, and the apparent activation energy ( E a ) was ∼500 kJ/mol, which was close to that of the diffusion of silicon and aluminum ions as well as metal–oxygen bond strengths, suggesting a three‐dimensional (3D) diffusion‐controlled reaction mechanism.