STRUCTURAL CHANGES AND MOLECULAR MOBILITY DURING PHYSICAL AGEING OF GLASSES

Publisher Website
Google Scholar
Abstract
The magnitude of secondary relaxation and heat capacity of a variety of glasses decrease on physical ageing. The decrease suggests a collapse of localized high-volume, high-entropy regions in its structure. Densification on ageing affects the kinetic, vibrational and electronic properties of a glass differently than does densification on compression. Tunneling centres responsible for the low-temperature behaviour of glasses are identified with the localized regions. Ageing causes a glass to approach a structure with properties of an isotropic elastic continuum. The results support a microscopically heterogeneous structure

This publication has 0 references indexed in Scilit: