کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4677669 | 1634814 | 2012 | 7 صفحه PDF | دانلود رایگان |
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.
► The sound velocity of FeH has been determined up to 70 GPa by IXS.
► Only nonmagnetic iron hydride follows Birch's law.
► Maximum abundance of hydrogen in the Earth's inner core is 0.23(6) wt.%.
Journal: Earth and Planetary Science Letters - Volumes 313–314, 1 January 2012, Pages 79–85