Computer Science – Sound
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012e%26psl.313...79s&link_type=abstract
Earth and Planetary Science Letters, Volume 313, p. 79-85.
Computer Science
Sound
Iron Hydride, Sound Velocity, Inelastic X-Ray Scattering, High Pressure, Earth'S Inner Core
Scientific paper
We have determined the density evolution of the sound velocity of dhcp-FeHx (x ≈ 1) up to 70 GPa at room temperature, by inelastic X-ray scattering and by X-ray diffraction. We find that the variation of VP with density is different for the ferromagnetic and nonmagnetic dhcp-FeHx, and that only nonmagnetic dhcp-FeHx follows Birch's law. Combining our results with Birch's law for iron and assuming an ideal two-component mixing model, we obtain an upper bound of the hydrogen content in the Earth's inner core, 0.23(6) wt.% H, corresponding to FeH0.13(3). The iron alloy with 0.23(6) wt.% H can satisfy the density, and compressional and shear sound velocities of the PREM inner core, assuming that there are no other light elements in the inner core.
Baron Alfred Q. R.
Fukui Hiroshi
Hirao Naohisa
Ishikawa Daisuke
Kamada Seiji
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