Search: id:"swepub:oai:DiVA.org:liu-44822" >
Structural properti...
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Mikhaylushkin, Arkady,1977-Linköpings universitet,Tekniska högskolan,Teoretisk Fysik
(author)
Structural properties of Fe1-xNix compressed and heated to the Earth's core conditions
- Article/chapterEnglish2008
Publisher, publication year, extent ...
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Dresden :Germany,2008
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:liu-44822
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-44822URI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:kon swepub-publicationtype
Notes
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Invited talk
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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.
Subject headings and genre
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NATURAL SCIENCES
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NATURVETENSKAP
Added entries (persons, corporate bodies, meetings, titles ...)
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Linköpings universitetTekniska högskolan
(creator_code:org_t)
Related titles
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In:FPLO Workshop,2008Dresden : Germany
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