Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 313, Issue -, Pages 79-85Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2011.11.002
Keywords
iron hydride; sound velocity; inelastic X-ray scattering; high pressure; Earth's inner core
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Funding
- Japan Society for the Promotion of Science
- Ministry of Education, Culture, Science, Sport, and Technology of the Japanese Government [18104009, 22000002]
- Grants-in-Aid for Scientific Research [18104009, 22000002, 09J04077] Funding Source: KAKEN
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We have determined the density evolution of the sound velocity of dhcp-FeHx (x approximate to 1) up to 70 GPa at room temperature, by inelastic X-ray scattering and by X-ray diffraction. We find that the variation of V-p 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. (C) 2011 Elsevier B.V. All rights reserved.
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