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Determining the Nucleation Rate Curve for Lithium Disilicate Glass by Differential Thermal Analysis
Author(s) -
Ray Chandra S.,
Day Delbert E.
Publication year - 1990
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.1151-2916.1990.tb06532.x
Subject(s) - nucleation , differential thermal analysis , crystallization , lithium disilicate , activation energy , materials science , lithium (medication) , supercooling , thermal analysis , thermodynamics , mineralogy , analytical chemistry (journal) , thermal , chemistry , diffraction , metallurgy , chromatography , optics , ceramic , physics , medicine , endocrinology
The crystallization of lithium disilicate (Li 2 O·2SiO 2 ) glass nucleated at various temperatures was studied by differential thermal analysis (DTA). A plot of the DTA crystallization peak height versus nucleation temperature closely resembles the classical nucleation rate curve for lithium disilicate glass whose maximum is at 453°C. The glass becomes saturated with internal nuclei when heated at 453°C for 10 h. The DTA technique is a rapid, alternative method for determining the temperature for maximum nucleation. The activation energy for crystallization, E , and the heat of crystallization, H , are independent of the concentration of nuclei and are 249±10 and 67±3 kJ/mol, respectively. The Avrami exponent, n , depends strongly on the concentration of nuclei in the glass.