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Structural properties of Fe1-xNix compressed and heated to the Earth's core conditions
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
2008 (English)In: FPLO Workshop,2008, Dresden: Germany , 2008Conference paper, Published paper (Refereed)
Abstract [en]

Cosmochemical, geochemical, and geophysical studies provide evidences that Earth's core contains iron with substantial (5 to 15 at. %) amounts of nickel and/or impurities of light elements. The results of our combined first-principles study and in-situ and temperature-quenched laser-heated diamond anvil-cell experiments on the high-pressure high-temperature structural behavior of pure Fe and Fe_0.9 Ni_0.1 alloy are reported. Our temperature-quenched experiments indicate that the face-centered cubic (fcc) phase of pure iron can exist in the pressure-temperature region above 160 GPa and 3700 K. In accord our theoretical results show that the fcc phase of Fe becomes as stable as the hexagonal-close-packed (hcp) phase at Earth's core condition (P ~ 300-360 GPa and T around 5000-6000 K). Further we demonstrate by means of in-situ angle-dispersive x-ray diffraction in internally heated diamond anvil cells (DACs) that by substantial alloying of Fe with Ni (10 at. %) a body-centered cubic phase can stabilize in the Earth's core. Our results give an evidence that the actual structure of the the Earth's core could be a complex phase, which is very sensitive to the presence of impurities of nickel, sulfur, silicon, etc. 

Place, publisher, year, edition, pages
Dresden: Germany , 2008.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-44822Local ID: 77764OAI: oai:DiVA.org:liu-44822DiVA: diva2:265684
Note
Invited talkAvailable from: 2009-10-10 Created: 2009-10-10

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Mikhaylushkin, Arkady

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