Aggregate Sound Velocities and Acoustic Grüneisen Parameter of Iron up to 300 GPa and 1,200 K

Successful interpretation of available geophysical data requires experimental and theoretical information on the elasticity of solids under physical conditions of Earth's interior. Because iron is considered as major component in Earth's core, elastic properties of iron at high pressures a...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2001-08, Vol.98 (17), p.9484-9489
Main Authors: Dubrovinsky, L. S., Dubrovinskaia, N. A., Le Bihan, T.
Format: Article
Language:English
Subjects:
Acoustic data
Ambient temperature
Bulk modulus
Cell aggregates
High pressure
High temperature
Inner cores
Iron
Metal aggregates
Particle velocity
Physical Sciences
Sound
Temperature dependence
Velocity
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Summary:Successful interpretation of available geophysical data requires experimental and theoretical information on the elasticity of solids under physical conditions of Earth's interior. Because iron is considered as major component in Earth's core, elastic properties of iron at high pressures and temperatures are very important for modeling its composition and dynamics. We use in situ x-ray diffraction data on ε-iron at static pressures up to 300 GPa and temperatures to 1,200 K to determine the Debye-Waller temperature factors and calculate aggregate sound velocities and Grüneisen parameter of ε-iron by using an approach that is based on Rietveld refinement at high pressures and temperatures.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.161583398