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Surface Devitrification and the Growth of Cristobalite in Borofloat ® (Borosilicate 8330) Glass
Author(s) -
Moğulkoç Berker,
Knowles Kevin M.,
Jansen Henri V.,
Ter Brake H. J. Marcel,
Elwenspoek Miko C.
Publication year - 2010
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.1551-2916.2010.03793.x
Subject(s) - borosilicate glass , devitrification , nucleation , materials science , cristobalite , activation energy , crystal growth , porous glass , mineralogy , chemical engineering , surface energy , crystal (programming language) , lead glass , crystallization , chemistry , crystallography , metallurgy , composite material , porosity , quartz , computer science , programming language , organic chemistry , engineering
Borofloat ® (borosilicate 8330) glass is an important type of inorganic glass, both scientifically and commercially. During prolonged heat treatment of this glass above its glass transition temperature of 525°C, heterogeneous nucleation, and growth of cristobalite crystals occur. The kinetics and morphology of this crystal growth have been studied for heat treatment temperatures at and above 660°C. The activation energy for crystal growth is estimated to be 185±10 kJ/mol. This is attributed to the diffusion of boron, rather than sodium, being the rate‐limiting step within the borosilicate framework. Contact with the atmosphere is shown to initiate the nucleation of cristobalite crystals, while deposition of a thin silicon nitride surface coating on the glass helps to prevent this nucleation.