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

页码：313 / 315

页数：3

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