Phase separation in pyrex glass.
The contrast between phases in pyrex glass was heightened for viewing in the electron microscope by exchanging silver ions for sodium ions in the glass. The scale of phase separation in pyrex was foud to be about 30 angstroms; sample of commercial soda-lime glass, prepared in the same way, showed no phase separtion.
Doremus
R H
RH
Turkalo
A M
AM