Iron-silicon alloy in Earth's core?

被引：121
|
作者：
Lin, JF [1 ]
Heinz, DL
Campbell, AJ
Devine, JM
Shen, GY
机构：
[1] Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA
[2] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA
[3] Univ Chicago, Consortium Adv Radiat Sources, Chicago, IL 60637 USA
来源：
SCIENCE | 2002年 / 295卷 / 5553期
关键词：
D O I：
10.1126/science.1066932
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
We have investigated the phase relations in the iron-rich portion of the iron-silicon (Fe-Si) alloys at high pressures and temperatures. Our study indicates that Si alloyed with Fe can stabilize the body-centered cubic (bcc) phase up to at least 84 gigapascals (compared to similar to10 gigapascals for pure Fe) and 2400 kelvin. Earth's inner core may be composed of hexagonal close-packed (hcp) Fe with up to 4 weight percent Si, but it is also conceivable that the inner core could be a mixture of a Si-rich bcc phase and a Si-poor hcp phase.
引用
收藏
页码：313 / 315
页数：3
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