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DOI	10.1029/2020GL088169
	Melting Curve and Phase Relations of Fe-Ni Alloys: Implications for the Earth's Core Composition
	Torchio R.; Boccato S.; Miozzi F.; Rosa A.D.; Ishimatsu N.; Kantor I.; Sévelin-Radiguet N.; Briggs R.; Meneghini C.; Irifune T.; Morard G.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Nickel is the second most abundant element in the Earth's core. However, the properties of Fe-Ni alloys are still poorly constrained under planetary cores conditions, in particular concerning the effect of Ni on the melting curve of Fe. Here we show that Ni alloying up to 36 wt% does not affect the melting curve of Fe up to 100 GPa. However, Ni strongly modifies the hexagonal-closed-packed/face-centered-cubic (hcp/fcc) phase boundary, pushing the hcp/fcc/liquid triple point of Fe-20wt%Ni to higher pressures and temperatures. Our results allow constraining the triple point for Fe-10wt%Ni, a composition relevant for the Earth interior, and point out a decrease of the melting temperature at core-mantle boundary by 400 K with respect to pure Fe. A lower amount of light elements than previously predicted is thus required to reduce the crystallization temperature of core materials below that of a peridotitic lower mantle, in better agreement with geochemical observations. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Binary alloys; Chemical elements; Coremaking; Melting; Nickel alloys; Core material; Core-mantle boundary; Crystallization temperature; Earth interior; Light elements; Melting curves; Phase relation; Triple points; Iron alloys; alloy; chemical composition; core-mantle boundary; crystallization; iron; melting; nickel; peridotite; temperature
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170140
作者单位	European Synchrotron Radiation Facility, Grenoble, France; Now at Sorbonne Université, Muséum National d' Histoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), Paris, France; Sorbonne Université, Muséum National dHistoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), Paris, France; Now at Dipartimento di Scienze della Terra, Universitá degli Studi di Milano, Milano, Italy; Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan; Institut for Fysik, Danmarks Tekniske Universitet, Kongens Lyngby, Denmark; Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Sciences, Roma Tre University of Rome, Rome, Italy; Geodynamics Research Center, Ehime University, Matsuyama, Japan; Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
推荐引用方式 GB/T 7714	Torchio R.,Boccato S.,Miozzi F.,et al. Melting Curve and Phase Relations of Fe-Ni Alloys: Implications for the Earth's Core Composition[J],2020,47(14).
APA	Torchio R..,Boccato S..,Miozzi F..,Rosa A.D..,Ishimatsu N..,...&Morard G..(2020).Melting Curve and Phase Relations of Fe-Ni Alloys: Implications for the Earth's Core Composition.Geophysical Research Letters,47(14).
MLA	Torchio R.,et al."Melting Curve and Phase Relations of Fe-Ni Alloys: Implications for the Earth's Core Composition".Geophysical Research Letters 47.14(2020).