High-temperature phase transitions and elasticity of silica polymorphs

Dmitry L. Lakshtanov, Stanislav V. Sinogeikin, Jay D. Bass

Research output: Contribution to journalArticlepeer-review

Abstract

The single-crystal acoustic velocities of α- and β-quartz were measured by Brillouin spectroscopy to a maximum temperature >1,500°C at room pressure. From these velocities, the single-crystal elastic moduli were calculated up to 1,050°C, exceeding the temperature range of previous measurements by 350°C for the elastic moduli and by 710°C for acoustic velocities. The ordinary refractive index (no) of α- and β-quartz was measured from room temperature to 800°C. In the temperature interval from ∼950 to 1,000°C a subtle change in the temperature derivative of the longitudinal acoustic velocity was observed in platelet geometry for all measured directions. The high-temperature acoustic velocity data may indicate the presence of a second phase, presumably β-cristobalite, that nucleates below 1,000°C.

Original languageEnglish (US)
Pages (from-to)11-22
Number of pages12
JournalPhysics and Chemistry of Minerals
Volume34
Issue number1
DOIs
StatePublished - Jan 2007

Keywords

  • Brillouin scattering
  • Cristobalite
  • Elastic constants
  • High temperature
  • Phase transitions
  • Quartz

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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