Abstract
The rapid-quenching technique extended the glass-forming region in the system Li2O-SiO2 toward the composition with high Li2O content. The ratio of the glass transition temperature Tg to the liquidus one T1 deviates largely from the so-called “two thirds rule” (Tg/T1=2/3) in the glasses containing large amounts of Li2O. The deviation was observed only in the glasses prepared by rapid quenching and it can be attributed to their high liquidus viscosity or small temperature variation of viscosity. The relation between the deviation from the “two thirds rule” and the glass-forming ability was discussed on the basis of the temperature and time variation curves of viscosity.
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