15 lines
1.4 KiB
Plaintext
15 lines
1.4 KiB
Plaintext
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Title: Stabilization of body-centred cubic iron under inner-core conditions
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Subject: 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.
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Creator: Acrobat PDFMaker 15 för Word
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Producer: Adobe PDF Library 15.0
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CreationDate: Sun May 21 15:15:46 2017
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ModDate: Tue Apr 30 00:36:14 2024
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Tagged: yes
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Form: none
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Pages: 21
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Encrypted: no
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Page size: 612 x 792 pts (letter) (rotated 0 degrees)
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File size: 433075 bytes
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Optimized: yes
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PDF version: 1.6
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