title: A reconstructive polyamorphous transition in borosilicate glass induced by irreversible compaction.
abstract: Understanding the response of glasses to high pressure is of key importance for clarifying energy-dissipation and the origin of material damage during mechanical load. In the absence of shear bands or motile dislocations, pressure-induced deformation is governed by elastic and inelastic structural changes which lead to compaction of the glass network. Here, we report on a pressure-induced reconstructive amorphous-amorphous transition which was detected in sodium borosilicate glass by Raman and Brillouin scattering. The transition occurs through the formation of four-membered danburite-type rings of BO4 and SiO4-tetrahedra. We suggest that the inelastic pressure-resistance is governed by the Si-O-Si-backbone of the mixed borosilicate network. We further show that compaction is accompanied by increasing structural homogeneity and interpret this as a universal phenomenon in non-crystalline materials.
authors: Otto Schott Institute, University of Jena, 07743 Jena, Germany.
authors: Sindy
authors: S
authors: Fuhrmann
authors: Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, University of Lyon 1, 69622 Villeurbanne, France.
authors: Thierry
authors: T
authors: Deschamps
authors: Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, University of Lyon 1, 69622 Villeurbanne, France.
authors: Bernard
authors: B
authors: Champagnon
authors: Otto Schott Institute, University of Jena, 07743 Jena, Germany.
authors: Lothar
authors: L
authors: Wondraczek