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 language | English (US) |
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Pages (from-to) | 11-22 |
Number of pages | 12 |
Journal | Physics and Chemistry of Minerals |
Volume | 34 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2007 |
Keywords
- Brillouin scattering
- Cristobalite
- Elastic constants
- High temperature
- Phase transitions
- Quartz
ASJC Scopus subject areas
- General Materials Science
- Geochemistry and Petrology