300 GPa以下镍的Hugoniot状态方程：对地球固体内核密度缺陷的启示

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors Pub Date : 2025-09-20 DOI:10.1016/j.pepi.2025.107454

Qing Zhang, Xun Liu, Yishi Wang, Yu Hu, Zehui Li, Haijun Huang

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引用次数: 0

摘要

利用两级轻气枪进行板击实验，将镍（Ni）的Hugoniot数据扩展到305 GPa。结合我们的结果和之前发表的数据，我们确定了Ni的激波速度(Us) -粒子速度（Up） Hugoniot关系为：Us=4.65362+1.42023Up。Ni的热力学参数是通过对Hugoniot和静态压缩数据的联合分析得出的，使我们能够将状态方程（EOS）扩展到与地球内核相关的条件。此外，我们根据最近发表的静态压缩数据重新分析了铁的EOS。我们的研究表明，纯铁的密度比内核的密度高0.59 (20)g/cm3。此外，在铁中加入10 wt%的Ni会使密度损失增加约0.10 g/cm3。

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Hugoniot equation of state of nickel up to 300 GPa: Implication on the density deficit of earth's solid inner core

Hugoniot data for nickel (Ni) were extended to 305 GPa through plate-impact experiments using a two-stage light gas gun. Combining our results with previously published data, we determined the shock velocity (Us)–particle velocity (Up) Hugoniot relation for Ni to be:

U_{s} = 4.653 (62) + 1.420 (23) U_{p}

. The thermodynamic parameters of Ni were derived through a joint analysis of the Hugoniot and static compression data, allowing us to extend the equation of state (EOS) to conditions relevant to Earth's inner core. Additionally, we reanalyzed the EOS of iron based on a recently published static compression data. Our study suggests that the density of pure iron is 0.59 (20) g/cm³ higher than that of the inner core. Moreover, adding 10 wt% Ni to iron increases this density deficit by approximately 0.10 g/cm³.

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来源期刊

Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理

CiteScore

5.00

自引率

4.30%

发文量

审稿时长

18.5 weeks

期刊介绍： Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.