Report

Iron-Silicon Alloy in Earth's Core?

Science  11 Jan 2002:
Vol. 295, Issue 5553, pp. 313-315
DOI: 10.1126/science.1066932

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


Abstract

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 ∼10 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.

  • * To whom correspondence should be addressed. E-mail: afu{at}geosci.uchicago.edu

View Full Text

Related Content