Silicate glasses, heated up, have in the transformation phase an endothermal effect. It is considerably smaller than melting a crystal. The reason for these heat effects are melting processes, disorder creating processes by the transition solid glass supercooled melt. By this process inner energy increases and free energy decreases.
Origin
Unknown
Journal Title
Proc 17Th Int Cong Glass Vol 3, Oct 1995 404-407
Sector
Special Glass
Class
S 1222