气候变化领域集成服务门户(CCPortal): Density of Fe-Ni-C Liquids at High Pressures and Implications for Liquid Cores of Earth and the Moon

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DOI	10.1029/2020JB021089
	Density of Fe-Ni-C Liquids at High Pressures and Implications for Liquid Cores of Earth and the Moon
	Zhu F.; Lai X.; Wang J.; Amulele G.; Kono Y.; Shen G.; Jing Z.; Manghnani M.H.; Williams Q.; Chen B.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The presence of light elements in the metallic cores of the Earth, the Moon, and other rocky planetary bodies has been widely proposed. Carbon is among the top candidates in light of its high cosmic abundance, siderophile nature, and ubiquity in iron meteorites. It is, however, still controversial whether carbon-rich core compositional models can account for the seismic velocity observations within the Earth and lunar cores. Here, we report the density and elasticity of Fe90Ni10-3 wt.% C and Fe90Ni10-5 wt.% C liquid alloys using synchrotron-based X-ray absorption experiments and first-principles molecular dynamics simulations. Our results show that alloying of 3 wt.% and 5 wt.% C lowers the density of Fe90Ni10 liquid by ∼2.9–3.1% at 2 GPa, and ∼3.4–3.6% at 9 GPa. More intriguingly, our experiments and simulations both demonstrate that the bulk moduli of the Fe-Ni-C liquids are similar to or slightly higher than those of Fe-Ni liquids. Thus, the calculated compressional velocities (vp) of Fe-Ni-C liquids are higher than that of pure Fe-Ni alloy, promoting carbon as a possible candidate to explain the elevated vp in the Earth's outer core. However, the values and slopes of both density and vp of the studied two Fe-Ni-C liquids do not match the outer core seismic models, suggesting that carbon may not be the sole principal light element in Earth's outer core. The high vp of Fe-Ni-C liquids does not match the presumptive vp of the lunar outer core well, indicating that carbon is less likely to be its dominant light element. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	cores of Earth and the Moon; density; Fe-Ni-C liquid; first-principles molecular dynamics; velocity; X-ray absorption
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187317
作者单位	School of Earth Sciences, China University of Geosciences, Wuhan, Hubei, China; Hawaiʻi Institute of Geophysics and Planetology, University of Hawaiʻi at Mānoa, Honolulu, HI, United States; Gemmological Institute, China University of Geosciences, Wuhan, Hubei, China; Department of Geology and Geophysics, Center for Computation and Technology, Louisiana State University, Baton Rouge, LA, United States; Department of Earth, Environmental, and Planetary Science, Case Western Reserve University, Cleveland, OH, United States; Geodynamics Research Center, Ehime University, Matsuyama, Ehime, Japan; HPCAT, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, United States; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Zhu F.,Lai X.,Wang J.,et al. Density of Fe-Ni-C Liquids at High Pressures and Implications for Liquid Cores of Earth and the Moon[J],2021,126(3).
APA	Zhu F..,Lai X..,Wang J..,Amulele G..,Kono Y..,...&Chen B..(2021).Density of Fe-Ni-C Liquids at High Pressures and Implications for Liquid Cores of Earth and the Moon.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Zhu F.,et al."Density of Fe-Ni-C Liquids at High Pressures and Implications for Liquid Cores of Earth and the Moon".Journal of Geophysical Research: Solid Earth 126.3(2021).