Grain-boundary effects in Brillouin scattering at ambient and high pressure

Details Grain-boundary effects in Brillouin scattering at ambient and high pressure Grain-boundary effects in Brillouin scattering at ambient and high pressure

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3623309g&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 23, CiteID L23309

Physics

2

Mineral Physics: High-Pressure Behavior, Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Mineral Physics: Instruments And Techniques, Physical Properties Of Rocks: Acoustic Properties

Scientific paper

Although refraction of light at grain boundaries can significantly alter Brillouin spectra-hence inferred acoustic velocities-of powder samples, we demonstrate that the effects of (multiple) elastic scattering can be eliminated through 1) use of refractive index-matching oils or 2) application of high pressures (≥1 GPa). In this manner, we determine the acoustic-wave velocities of soda-lime glass powder to pressures of 13 GPa, finding good agreement with previous measurements on bulk samples. Our results provide a baseline for reliable acoustic-wave velocity measurements at high pressures via Brillouin spectroscopy on polycrystalline samples.

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