The glass transition of a liquid to a solid-like state may occur with either cooling or compression. The transition comprises … See more

The definition of the glass and the glass transition are not settled, and many definitions have been proposed over the past century.
Franz Simon: Glass is a rigid material obtained fr… See more

Refer to the figure on the bottom right plotting the heat capacity as a function of temperature. In this context, Tg is the temperature corresponding to point A on the curve.
Different op… See more

In 1971, Zeller and Pohl discovered that when glass is at a very low temperature ~1K, its specific heat has a linear component: . This is an unusual effect, because crystal material typically has , as in the … See more

As a liquid is supercooled, the difference in entropy between the liquid and solid phase decreases. By extrapolating the heat capacity of the supercooled liquid below its glass transition temperature, it is possible to calculat… See more

Silica (the chemical compound SiO2) has a number of distinct crystalline forms in addition to the quartz structure. Nearly all of the crystalline forms involve tetrahedral SiO4 units linked together by shared vertices in different arr… See more