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Progressive transformations of silica glass upon densification
C Sonneville1, A Mermet, B Champagnon
1Laboratoire de Physico Chimie des Matériaux Luminescents, UMR5620, Domaine Scientifique de la Doua, Université de Lyon, Université Lyon 1, 69622 Villeurbanne cedex, France.
The Journal of Chemical Physics
|October 2, 2012
Summary
Silica glass elastic anomaly disappears with increasing pressure, transitioning from low-density to high-density amorphous silica above 12 GPa. This transformation alters its mechanical behavior under extreme conditions.
Area of Science:
- Materials Science
- Geophysics
- Solid State Physics
Background:
- Silica glass exhibits unique elastic properties under high pressure.
- Understanding pressure-induced transformations is crucial for geological and material applications.
Purpose of the Study:
- To investigate the elastic and plastic behaviors of silica glass under high pressure.
- To analyze the pressure-induced transformation from low-density to high-density amorphous silica.
Main Methods:
- In situ Raman spectroscopy
- In situ Brillouin spectroscopy
- High-pressure densification (12 GPa to 22 GPa)
Main Results:
- Elastic anomaly progressively vanished up to 12 GPa.
- Elastic anomaly was completely suppressed above 12 GPa.
- Mechanical behavior change attributed to low-density to high-density amorphous silica transformation.
Conclusions:
- The elastic anomaly in silica glass is suppressed above 12 GPa.
- Pressure-induced densification transforms silica glass to a high-density amorphous state.
- Brillouin spectroscopy effectively characterizes these high-pressure mechanical changes.
