Phase relations of iron–silicon alloys at high pressure and high temperature |
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| Authors: | Yasuhiro Kuwayama Toshimitsu Sawai Kei Hirose Nagayoshi Sata Yasuo Ohishi |
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| Institution: | (1) Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka Kanagawa, 237-0061, Japan;(2) Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;(3) Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun Hyogo, 679-5198, Japan |
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| Abstract: | 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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