globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2892
论文题名:
Stabilization of body-centred cubic iron under inner-core conditions
作者: Belonoshko A.B.; Lukinov T.; Fu J.; Zhao J.; Davis S.; Simak S.I.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:4
起始页码: 312
结束页码: 316
语种: 英语
Scopus关键词: crystal structure ; diffusion ; high temperature ; inner core ; instability ; iron ; shear modulus ; stability analysis ; stabilization
英文摘要: The Earth's 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. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105815
Appears in Collections:气候减缓与适应
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作者单位: Condensed Matter Theory, Department of Theoretical Physics, AlbaNova University Center, Royal Institute of Technology (KTH), Stockholm, Sweden; Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian, China; Chilean Committee of Nuclear Energy (CCHEN), Casilla 188-D, Santiago, Chile; Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden

Recommended Citation:
Belonoshko A.B.,Lukinov T.,Fu J.,et al. Stabilization of body-centred cubic iron under inner-core conditions[J]. Nature Geoscience,2017-01-01,10(4)
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