Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3312s02m&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 12, CiteID L12S02
Physics
8
Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
We determined pressure-volume (P-V) data for (Mg0.6Fe0.4)SiO3 post-perovskite (ppv) upon decompression from 140 GPa. The data can be divided into four regions: above 95 GPa, diffraction peaks are sharp and follow a smooth and tight P-V curve; below 90 GPa, peak widths increase, and a kink develops in the P-V curve; below 60 GPa, the broadening plateaus; below 4.6 GPa, the ppv pattern disappears. This suggests that defects and stacking faults start to develop in ppv at 90 GPa and saturate at 60 GPa, and the structure disintegrates below 4.6 GPa. The volume and density of the (Mg0.6Fe0.4)SiO3 ppv is well constrained by our data at the pressures relevant to the Earth's D'' layer. Our bulk modulus in this region is much higher than theoretical calculations for pure MgSiO3 ppv.
Hemley Russell J.
Mao Ho-kwang
Mao Wendy L.
Prakapenka Vitali B.
Shu Jin-fu
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