A second-order transition
in which a supercooled melt yields, on cooling, a glassy structure. Below the glass-transition temperature
the physical properties vary in a manner similar to those of the crystalline phase.
Example: Lithium disilicate crystals melt at
the melt can be supercooled to the glass-transition temperature
below which the viscous liquid freezes to a rigid amorphous glass.
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
on page 583
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook