Anomalous sound velocities in polycrystalline MgO under non-hydrostatic compression

Details Anomalous sound velocities in polycrystalline MgO under non-hydrostatic compression Anomalous sound velocities in polycrystalline MgO under non-hydrostatic compression

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3803304g&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 3, CiteID L03304

Physics

1

Mineral Physics: High-Pressure Behavior, Mineral Physics: Optical, Infrared, And Raman Spectroscopy

Scientific paper

Brillouin scattering from polycrystalline MgO (periclase) non-hydrostatically compressed to, and decompressed from, 60 GPa at room temperature documents shear- and compressional-wave velocities ˜20% lower than values measured under hydrostatic compression. Calculations reveal that wave velocities can be lowered due to the elastic effects of non-hydrostatic stresses, but by only a few percent. Neither these elastic effects nor preferred orientation can account for the reduction in the sound velocity.

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