Elasticity of MgO and a Primary Pressure Scale to 55 GPa

We have studied the elasticity and pressure-density equation of state of MgO in diamond cells to 55 GPa and have doubled the previous pressure limit of accurate elasticity determinations for crystals. Integrating single-crystal velocity data from Brillouin scattering measurements and density data fr...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2000-12, Vol.97 (25), p.13494-13499
Main Authors: Zha, C S, Mao, H, Hemley, R J
Format: Article
Language:English
Subjects:
Brillouin scattering
Crystallography
Elastic anisotropy
Equations of state
Fluorescence
Helium
High pressure
Particle velocity
Physical Sciences
Physics
Pressure
Ultrasonics
Water pressure
X ray diffraction
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Summary:We have studied the elasticity and pressure-density equation of state of MgO in diamond cells to 55 GPa and have doubled the previous pressure limit of accurate elasticity determinations for crystals. Integrating single-crystal velocity data from Brillouin scattering measurements and density data from polycrystalline x-ray diffraction, we obtained the three principal elastic tensor elements (C11, C12, and C44) and various secondary elasticity parameters, including single-crystal elastic anisotropy, Cauchy relation, aggregate sound velocities, and Poisson's ratio, as functions of pressure. The present study also provides a direct determination of pressure without recourse to any prior pressure standard, thus creating a primary pressure scale. The commonly used ruby fluorescence pressure scale has thus been improved to 1% accuracy by the new MgO scale.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.240466697