Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-02-22
Journal of Physics Condensed Matter / JOURNAL OF PHYSICS-CONDENSED MATTER 20 (2008) 485221
Physics
Condensed Matter
Other Condensed Matter
Scientific paper
10.1088/0953-8984/20/48/485221
In addition of a flow, plastic deformation of structural glasses (in particular amorphous silica) is characterized by a permanent densification. Raman spectroscopic estimators are shown to give a full account of the plastic behavior of silica under pressure. While the permanent densification of silica has been widely discussed in terms of amorphous-amorphous transition, from a plasticity point of view, the evolution of the residual densification with the maximum pressure of a pressure cycle can be discussed as a density hardening phenomenon. In the framework of such a mechanical aging effect, we propose that the glass structure could be labelled by the maximum pressure experienced by the glass and that the saturation of densification could be associated with the densest packing of tetrahedra only linked by their vertices.
Barthel Etienne
Champagnon Bernard
Coussa Camille
Deschamps Thierry
Martinet Christine
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