Statistics – Computation
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3505306c&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 5, CiteID L05306
Statistics
Computation
13
Geochemistry: Composition Of The Core, Computational Geophysics: Modeling (4255), Mineral Physics: Equations Of State, Geochemistry: Mineral And Crystal Chemistry (3620)
Scientific paper
The stable phase of iron (Fe) in the Earth's core has been the subject of extensive studies, yet still remains controversial. Hexagonal close-packed structure (hcp) is the accepted stable form of pure Fe; however, it has been recently proposed that a body-centered-cubic (bcc) structured alloy of Fe with lighter elements would be a strong candidate. Experiments and ab initio calculations have shown that small amounts of silicon can stabilize the bcc phase with respect to the hcp phase. In this study we examine the effect at core conditions by adding small concentrations of carbon (C), sulphur (S) and oxygen (O) to iron using electronic structure calculations. We analyze the effect of the light elements on the energy difference between the two structures, and we conclude that the bcc phase tends to be stabilized by the alloys, strengthening the case for a bcc-structured inner core of the Earth.
Brodholt John P.
Côté Alexander S.
Vocadlo Lidunka
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