Anomalous sound velocities in polycrystalline MgO under non-hydrostatic compression

A. E. Gleason; H. Marquardt; B. Chen; S. Speziale; J. Wu; R. Jeanloz

doi:10.1029/2010GL045860

Anomalous sound velocities in polycrystalline MgO under non-hydrostatic compression

A. E. Gleason
, H. Marquardt
, B. Chen
, S. Speziale
, J. Wu
, R. Jeanloz

University of California at Berkeley
Helmholtz Centre Potsdam - German Research Centre for Geosciences
Lawrence Berkeley National Laboratory

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

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.

Original language	English
Article number	L03304
Journal	Geophysical Research Letters
Volume	38
Issue number	3
DOIs	https://doi.org/10.1029/2010GL045860
State	Published - 1 Feb 2011
Externally published	Yes

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10.1029/2010GL045860

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abstract = "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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AU - Gleason, A. E.

AU - Marquardt, H.

AU - Chen, B.

AU - Speziale, S.

AU - Wu, J.

AU - Jeanloz, R.

PY - 2011/2/1

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N2 - 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.

AB - 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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M3 - 文章

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Anomalous sound velocities in polycrystalline MgO under non-hydrostatic compression

Abstract

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