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Effect of Alkali Ions on the Crystallization of 3BaO·5SiO 2 Glass
Author(s) -
Freiman Stephen W.,
Onoda George Y.
Publication year - 1997
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.1151-2916.1997.tb03265.x
Subject(s) - crystallization , alkali metal , materials science , chemical engineering , dielectric , base (topology) , crystal growth , mineralogy , glass transition , composite material , crystallography , chemistry , polymer , organic chemistry , mathematical analysis , mathematics , optoelectronics , engineering
In this study we have investigated the effects of alkali additions on the spherulitic crystallization process in 3BaO·5SiO 2 glass. Both Li + and Na + increased the growth rate of the spherulites and reduced the crystallization temperature from that in the base glass. Li + and Na + also reduced the temperature at which the microstructural transformation from spherulites to laths took place. Dielectric loss measurements suggest that the effect of the alkali additions on crystallization temperature is due to their concentration in grain boundaries, thereby lowering the viscosity of the remaining glass, and increasing mobility rates.