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Origin of Viscosity Increase of Phase‐Separated Borosilicate Glasses
Author(s) -
Tomozawa Minoru,
Sridharan Srinivasan,
Takamori Takeshi
Publication year - 1992
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.1151-2916.1992.tb04394.x
Subject(s) - borosilicate glass , viscosity , phase (matter) , temperature dependence of liquid viscosity , thermodynamics , relaxation (psychology) , materials science , relative viscosity , mineralogy , chemistry , composite material , organic chemistry , psychology , social psychology , physics
The viscosity of some borosilicate glasses increases with heat‐treatment time for phase separation. The viscosity increase in the initial stage of phase separation is attributed to the composition change of the separated phases. The origin of the viscosity increase in the later stage of phase separation is the subject of controversy. Namely, the viscosity increase has been attributed to two different mechanisms: (1) environmental relaxation and (2) the increase of silica content in the high‐viscosity silica‐rich continuous phase. Analyses are presented to show that the latter model is consistent with the experimental data.