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Stabilization of body-centred cubic iron under inner-core conditions
Royal Institute Technology KTH, Sweden.
Royal Institute Technology KTH, Sweden.
Royal Institute Technology KTH, Sweden; Dalian University of Technology, Peoples R China.
Dalian University of Technology, Peoples R China.
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2017 (English)In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 10, no 4, 312-+ p.Article in journal (Refereed) Published
Abstract [en]

The Earths solid core is mostly composed of iron. However, despite being central to our understanding of core properties, the stable phase of iron under inner-core conditions remains uncertain. The two leading candidates are hexagonal close-packed and body-centred cubic (bcc) crystal structures, but the dynamic and thermodynamic stability of bcc iron under inner-core conditions has been challenged. Here we demonstrate the stability of the bcc phase of iron under conditions consistent with the centre of the core using ab initio molecular dynamics simulations. We find that the bcc phase is stabilized at high temperatures by a diffusion mechanism that arises due to the dynamical instability of the phase at lower temperatures. On the basis of our simulations, we reinterpret experimental data as support for the stability of bcc iron under inner-core conditions. We suggest that the diffusion of iron atoms in solid state may explain both the anisotropy and the low shear modulus of the inner core.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2017. Vol. 10, no 4, 312-+ p.
National Category
Geochemistry
Identifiers
URN: urn:nbn:se:liu:diva-136573DOI: 10.1038/NGEO2892ISI: 000398162800021OAI: oai:DiVA.org:liu-136573DiVA: diva2:1090306
Note

Funding Agencies|Swedish Research Council (VR) [2013-5767, 2014-4750]; National Magnetic Confinement Fusion Program of China [2015GB118000]; China Scholarship Council; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]

Available from: 2017-04-24 Created: 2017-04-24 Last updated: 2017-05-21

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other style
More styles
Language
  • de-DE
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  • en-US
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  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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