Antonangeli,D., Siebert,J., Badro,J., Farber,D.L., Fiquet,G., Morard,G. and Ryerson,F.J.(2010): Composition of the Earth's inner core from high-pressure sound velocity measurements in Fe-Ni-Si alloys. Earth and Planetary Science Letters, 295, 292-296.

『鉄−ニッケル−珪素合金における高圧音速測定からの地球の内核の組成』

『Abstract
　We performed room-temperature sound velocity and density measurements on a polycrystalline alloy, Fe0.89Ni0.04Si0.07, in the hexagonal close-packed (hcp) phase up to 108 GPa. Over the investigated pressure range the aggregate compressional sound velocity is 〜9％ higher than in pure iron at the same density. The measured aggregate compressional (Vp) and shear (Vs) sound velocities, extrapolated to core densities and corrected for anharmonic temperature effects, are compared with seismic profiles. Our results provide constraints on the silicon abundance in the core, suggesting a model that simultaneously matches the primary seismic observables, density, P-wave and S-wave velocities, for an inner core containing 4 to 5 wt.％ of Ni and 1 to 2 wt.％ of Si.

Keywords: Fe-Ni-Si alloy; aggregate compressional and shear sound; velocities; high pressure; inner core; light elements』

1. Introduction
2. Experimental details
3. Results and discussion
4. Conclusions
Acknowledgment
References

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