DOI: 10.1016/j.epsl.2018.04.013
Scopus记录号: 2-s2.0-85046120426
论文题名: The elastic properties of hcp-Fe alloys under the conditions of the Earth's inner core
作者: Li Y. ; Vočadlo L. ; Brodholt J.P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493 起始页码: 118
结束页码: 127
语种: 英语
英文关键词: AIMD
; Earth's inner core
; elasticity
; iron alloys
Scopus关键词: Acoustic wave velocity
; Alloying elements
; Calculations
; Elasticity
; Molecular dynamics
; Ab initio molecular dynamics
; AIMD
; Anelasticity
; Direct simulation
; Earth's inner cores
; Elastic properties
; Light elements
; Seismic velocities
; Iron alloys
; alloy
; computer simulation
; elasticity
; inner core
; iron
; solid solution
英文摘要: Geophysical and cosmochemical constraints suggest the inner-core is mainly composed of iron with a few percent of light elements. However, despite extensive studies over many years, no single alloying light-element has been found that is able to simultaneously match the observed inner-core density and both seismic velocities. This has motivated a number of suggestions of other mechanism to lower velocities, such as anelasticity or premelting. However, an unexplored possibility is that a combination of two or more light-elements might produce the desired reduction in velocities and densities of the inner core. In order to test this, we use ab initio molecular dynamics calculations to map the elastic property space of hcp-Fe alloyed with S, Si and C at 360 GPa up to the melting temperature. Based on a mixing solid solution model together with direct simulations on the ternaries, we found a number of compositions which are able to match the observed properties of the inner core. This is the first time that the density, VP, Vs and the Poisson's ratio of the inner core have been matched directly with an hcp-Fe alloy. © 2018 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109872
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: Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom; Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, 0316, Norway
Recommended Citation:
Li Y.,Vočadlo L.,Brodholt J.P.. The elastic properties of hcp-Fe alloys under the conditions of the Earth's inner core[J]. Earth and Planetary Science Letters,2018-01-01,493