Journal
PHYSICS AND CHEMISTRY OF MINERALS
Volume 36, Issue 9, Pages 511-518Publisher
SPRINGER
DOI: 10.1007/s00269-009-0296-0
Keywords
Iron; Iron-silicon alloy; Phase relation; Inner core; Diamond-anvil cell; High pressure
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [2005A5013LD2-np, 2005B0010, 2006-2008A0099]
- Grants-in-Aid for Scientific Research [20001005] Funding Source: KAKEN
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The phase relations of Fe-6.4 wt% Si and Fe-9.9 wt% Si have been investigated up to 130 GPa and 2,600 K based on in situ synchrotron X-ray diffraction measurements in a laser-heated diamond-anvil cell along with chemical analysis of the quenched samples using a field-emission electron probe microanalyzer. We found that the maximum solubility of silicon in solid hcp-iron increases with increasing pressure. Linear extrapolation of the phase boundary between hcp + B2 and hcp phases for Fe-9.9 wt% Si suggests that the solid hcp-iron can include more than 9.9 wt% Si at the Earth's inner-core conditions. If silicon is a major light element in the outer core, a substantial amount of silicon may be incorporated into the inner core during inner-core solidification.
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