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Anomalous sound velocities in polycrystalline MgO under non‐hydrostatic compression
Author(s) -
Gleason A. E.,
Marquardt H.,
Chen B.,
Speziale S.,
Wu J.,
Jeanloz R.
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2010gl045860
Subject(s) - crystallite , hydrostatic equilibrium , periclase , compression (physics) , materials science , brillouin scattering , shear waves , hydrostatic pressure , shear (geology) , scattering , geology , mineralogy , acoustics , composite material , optics , mechanics , physics , magnesium , laser , quantum mechanics , metallurgy
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.