globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.11.043
Scopus记录号: 2-s2.0-85035125529
论文题名:
Sound velocities and density measurements of solid hcp-Fe and hcp-Fe–Si (9 wt.%) alloy at high pressure: Constraints on the Si abundance in the Earth's inner core
作者: Antonangeli D.; Morard G.; Paolasini L.; Garbarino G.; Murphy C.A.; Edmund E.; Decremps F.; Fiquet G.; Bosak A.; Mezouar M.; Fei Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482
起始页码: 446
结束页码: 453
语种: 英语
英文关键词: Earth's inner core ; high pressure ; high temperature ; iron ; iron–silicon alloys ; seismic wave velocities
Scopus关键词: Acoustic wave velocity ; Density measurement (specific gravity) ; Iron ; Shear flow ; Silicon ; Velocity ; Anharmonic effect ; Earth's inner cores ; High pressure ; High temperature ; Linear mixing models ; Seismic wave velocity ; Shear sound velocities ; Si concentration ; Silicon alloys ; alloy ; density ; high pressure ; high temperature ; inner core ; iron ; seismic wave ; silicon ; sound velocity ; wave velocity
英文摘要: We carried out sound velocity and density measurements on solid hcp-Fe and an hcp-Fe–Si alloy with 9 wt.% Si at 300 K up to ∼170 and ∼140 GPa, respectively. The results allow us to assess the density (ρ) dependence of the compressional sound velocity (VP) and of the shear sound velocity (VS) for pure Fe and the Fe–Si alloy. The established VP–ρ and VS–ρ relations are used to address the effect of Si on the velocities in the Fe–FeSi system in the range of Si concentrations 0 to 9 wt.% applicable to the Earth's core. Assuming an ideal linear mixing model, velocities vary with respect to those of pure Fe by ∼+80 m/s for VP and ∼−80 m/s for VS for each wt.% of Si at the inner core density of 13 000 kg/m3. The possible presence of Si in the inner core and the quantification of its amount strongly depend on anharmonic effects at high temperature and on actual core temperature. © 2017
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110105
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), UMR CNRS 7590, Sorbonne Universités, UPMC, Muséum National d'Histoire Naturelle, IRD UR 206, Paris, 75252, France; European Synchrotron Radiation Facility, BP 220, Grenoble Cedex, 38043, France; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States

Recommended Citation:
Antonangeli D.,Morard G.,Paolasini L.,et al. Sound velocities and density measurements of solid hcp-Fe and hcp-Fe–Si (9 wt.%) alloy at high pressure: Constraints on the Si abundance in the Earth's inner core[J]. Earth and Planetary Science Letters,2018-01-01,482
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