Research Project
Grant-in-Aid for Young Scientists (B)
I performed in situ x-ray diffraction studies on Fe and Fe alloys using a laser heated diamond anvil cell. The results show the wide stability field of the hcp phases of Fe and Fe-10 wt% Ni alloy up to 320 GPa and 4,500 K and their small temperature dependences of the c/a ratio of less than 1x10-6 K-1. I also performed ab initio molecular dynamics simulations to calculate the elastic properties of Fe and Fe alloys. The results indicats the elastic isotropy of hcp Fe and Fe-Ni alloys at the Earth's core condition, but the addition of light elements increases the elastic anisotropy of iron alloys. The high pressure and temperature experiments on Fe-Si alloy using a laser heated diamond anvil cell indicate that the more than 9.9 wt% Si can be soluble in the solid hcp Fe alloy at the conditions of the Earth's inner core. These results show that the Fe-Si alloy in the inner core would explain the seismic anisotropy in the inner core.
All 2014 2013 2012 2011 Other
All Journal Article (14 results) (of which Peer Reviewed: 13 results) Presentation (12 results) Book (2 results)
Journal of Chemical Physics
Volume: 140 Pages: 74501-74501
Journal of Geophysical Research : Solid Earth
Volume: 119-6 Issue: 6 Pages: 4656-4665
10.1002/2014jb010972
Physics of the Earth and Planetary Interiors
Volume: 228 Pages: 186-191
J. Chem. Phys.
Volume: 217 Pages: 31-35
Phys. Earth. Planet. Inter.
Phys. Earth Planet. Inter.
Journal of Geophysical Research B : Solid Earth
Volume: 117
J. Geophys. Res.
Physics and Chemistry of Minerals
Volume: 38 Pages: 591-597
Physical Review Letters
Volume: 107 Pages: 45701-45701
Phys. Rev. Lett.
Phys. Chem. Miner