Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.025504
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Funding
- Grant-in-aid for Young Scientists (A) [18684029]
- Challenging Exploratory Research [21654075]
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- National Science Foundation [EAR073881]
- Grants-in-Aid for Scientific Research [21654075, 18684029] Funding Source: KAKEN
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Acoustic wave velocities of SiO2 glass were measured up to pressures of 207 GPa using newly developed Brillouin scattering spectroscopic techniques to address the nature of pressure-induced structural changes. The acoustic wave velocity data suggests three distinct pressure regimes, two of which correspond to changes in the Si-O coordination number with pressure, and one of which indicates the stability of sixfold-coordinated Si over a broad pressure interval from similar to 40-140 GPa. An anomalous increase in the effect of pressure on velocity at 140 GPa most likely corresponds to the onset of structural densification associated with an increase in coordination number from sixfold to a higher coordination state.
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