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Devitrification Kinetics and Mechanism of K 2 O–CaO–SrO–BaO–B 2 O 3 –SiO 2 Glass‐Ceramic
Author(s) -
Jean JauHo,
Fang YuChing,
Dai Steve X.,
Wilcox David L.
Publication year - 2001
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.1151-2916.2001.tb00841.x
Subject(s) - devitrification , cristobalite , activation energy , crystallization , nucleation , cordierite , kinetics , materials science , mineralogy , diffusion , analytical chemistry (journal) , ceramic , chemistry , thermodynamics , metallurgy , quartz , physics , organic chemistry , quantum mechanics , chromatography
The devitrification kinetics and mechanism of a low‐dielectric, low‐temperature, cofirable K 2 O–CaO–SrO–BaO–B 2 O 3 –SiO 2 glass‐ceramic have been investigated. Crystalline phases including cristobalite (SiO 2 ) and pseudowollastonite ((Ca,Ba,Sr) SiO 3 ) are formed during firing. Activation energy analysis shows that the nucleation of the crystalline phases is controlled by phase separation of the glass. The crystallization kinetics of both cristobalite and pseudowollastonite obey Avrami‐like behavior, and the results show an apparent activation energy close to that of the diffusion of alkaline and alkali ions in the glass, suggesting that diffusion is rate limiting. The above conclusion is further supported by analysis of measured growth rates.