ArticleScientific reports2025
Pressure-induced amorphous-amorphous transition in pre-densified silica glass: an experimental exploration of the potential energy landscape.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Despite the difficulty of experimentally studying polyamorphic transitions in high-Tg glasses, it is well known that silica glass has two high-density phases: the cold-compressed and hot-compressed high-density amorphous phases (c-HDA and h-HDA). By means of vibrational spectroscopy techniques under pressure, we first evidence that the yield strength under hydrostatic pressure is identical for glasses of similar density, whatever the thermo-mechanical history, showing that the elastic limit of a silica glass depends solely of its density. Our results also reveal the changes in the energy landscape of amorphous silica under high pressure. Above a certain threshold pressure, the energy barriers between the different amorphous phases vanish and the glass is automatically driven toward the c-HDA phase, whatever the initial structure and the temperature of compression. Very high pressures can therefore erase all traces of a glass's thermodynamic history.
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