Journal
AMERICAN MINERALOGIST
Volume 95, Issue 5-6, Pages 880-883Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2010.3430
Keywords
Iron; high pressure; magnetic transition; inner core
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Funding
- JSPS
- Earthquake Research Institute, Japan
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High-pressure experiments and ab initio calculations on the hexagonal close-packed (hcp) structure of pure iron were performed to investigate a pressure-induced magnetic transition and the equation of state in the pressure range of 0-107 and 0-400 GPa, respectively. The experimental data at room temperature showed a significant change in the cell parameter ratio at 55 GPa without any major structural changes occurring. Ab initio calculations at 0 K indicate that the change in the cell parameter ratio observed in the high-pressure experiments corresponds to a magnetic transition from an antiferromagnetic state to a nonmagnetic state. If the hcp-Fe is stable under inner core conditions, then the density of nonmagnetic hcp-Fe is similar to 6% denser than that of the inner core, as determined using the PREM model. This supports the view that the composition of the inner core should be composed of iron and a significant amount of lighter elements.
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