About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
Origin of Viscosity Increase of Phase‐Separated Borosilicate Glasses
Abstract
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. Copyright © 1992, Wiley Blackwell. All rights reserved