BRILLOUIN-SCATTERING AND ULTRASONIC STUDIES AT HIGH-TEMPERATURE AND HIGH-PRESSURE

Authors
Citation
Ja. Xu, BRILLOUIN-SCATTERING AND ULTRASONIC STUDIES AT HIGH-TEMPERATURE AND HIGH-PRESSURE, Chemical geology, 128(1-4), 1996, pp. 17-24
Citations number
28
Categorie Soggetti
Geochemitry & Geophysics
Journal title
ISSN journal
00092541
Volume
128
Issue
1-4
Year of publication
1996
Pages
17 - 24
Database
ISI
SICI code
0009-2541(1996)128:1-4<17:BAUSAH>2.0.ZU;2-J
Abstract
Brillouin scattering provides a possibility to determine accurately ac oustic velocities. However, usual Brillouin scattering measurement can not be performed on a molten sample. The S/G/S Brillouin scattering me thod was thus proposed. In the present work, we report acoustic veloci ty measurements on two glasses (water-white glass and window glass) at high pressures and temperatures, where a sharp turning point in the v elocity-temperature plots indicates the passing of the glass transitio n temperature theta(g). An ultrasonic method was used for measurement of the velocity of the compressional wave at high temperature and pres sure up to 1500 degrees C and 6.5 GPa. The high-temperature experiment s at different pressures have shown the same phenomenon as found in S/ G/S Brillouin scattering measurements.