Spectroscopic evidence for ultrahigh-pressure polymorphism in SiO2 glass

Motohiko Murakami, Jay D. Bass

Research output: Contribution to journalArticlepeer-review


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 ∼40-140GPa. 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.

Original languageEnglish (US)
Article number025504
JournalPhysical review letters
Issue number2
StatePublished - Jan 15 2010

ASJC Scopus subject areas

  • General Physics and Astronomy


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