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Effect of Simultaneous Nucleation and Crystal Growth on DSC Crystallization Peaks of Glasses
Author(s) -
Rodrigues Alisson M.,
Costa Alberth M. C.,
Cabral Aluisio A.
Publication year - 2012
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.1551-2916.2012.05333.x
Subject(s) - nucleation , crystallization , differential scanning calorimetry , silicate glass , supercooling , materials science , crystallography , crystal (programming language) , crystal growth , mineralogy , analytical chemistry (journal) , thermodynamics , chemical engineering , chemistry , composite material , chromatography , engineering , physics , computer science , programming language
In this study, the change of the height of the crystallization peak, (δ T ) p , and the reciprocal of the crystallization peak temperature, 1/ T p , were investigated as a function of nucleation heat‐treatment time for two silicate glasses: (2 BaO · TiO 2 ·2 SiO 2 — B 2 TS 2 ) and lithium disilicate ( Li 2 O ·2 SiO 2 — LS 2 ). Then, monolithic pieces were heat‐treated in a differential scanning calorimetry furnace. The results demonstrated that these glasses behave similarly with respect to peak crystallization temperature, i.e., 1/ T p decreases with the heating rate for nucleation (φ n ). However, the results with B 2 TS 2 samples demonstrated that (δ T ) p increases with rising heating rates for nucleation (shorter nucleation heat treatment times), φ n , whereas (δ T ) p was found to decrease with φ n in the LS 2 specimens. This unexpected behavior is attributed to the extensive overlapping of the I ( T ) and U ( T ) curves shown by fresnoite glass.