气候变化领域集成服务门户(CCPortal): Resistivity saturation of hcp Fe-Si alloys in an internally heated diamond anvil cell: A key to assessing the Earth's core conductivity

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DOI	10.1016/j.epsl.2020.116357
	Resistivity saturation of hcp Fe-Si alloys in an internally heated diamond anvil cell: A key to assessing the Earth's core conductivity
	Inoue H.; Suehiro S.; Ohta K.; Hirose K.; Ohishi Y.
发表日期	2020
ISSN	0012821X
卷号	543
英文摘要	Electrical resistivity and thermal conductivity of iron (Fe)-light element alloys at high pressure and temperature are key parameters to constrain the dynamics and thermal evolution of the Earth's core. We determined the electrical resistivity of hcp Fe-2, 4 and 6.5 wt.% silicon (Si) alloys up to 117 GPa and 3120 K using a four-terminal method in an internally heated diamond-anvil cell. The temperature dependence of electrical resistivity of hcp Fe-Si alloys was suppressed as both Si concentration and temperature increased, which indicates the resistivity saturation phenomenon: the electrical resistivity of metal asymptotically approaches the “saturation resistivity”. Our results are fully reproduced by a highly resistive saturation model, and the obtained saturation resistivities for hcp Fe-Si alloys are comparable to those for hcp pure Fe at around 100 GPa. If Si is a major light element in the Earth's core, the pure Fe like saturation resistivity would keep the core conductivity high enough to induce active dynamics there and rapid growth of the inner core. © 2020 Elsevier B.V.
关键词	Earth's core electrical resistivity Fe-Si alloys resistivity saturation thermal conductivity
英文关键词	Acoustic wave velocity; Chemical elements; Electric conductivity; Silicon alloys; Temperature distribution; Thermal conductivity; Diamond-anvil cell; High-pressure and temperatures; Saturation model; Saturation phenomenons; Si concentration; Temperature dependence; Terminal method; Thermal evolution; Iron alloys; alloy; core (planetary); diamond anvil cell; Earth structure; electrical resistivity; inner core; iron; P-T conditions; saturation; silicon; thermal conductivity; thermal evolution; thermal structure
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202670
作者单位	Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, 152-8551, Japan; Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, 152-8550, Japan; Department of Earth and Planetary Science, The University of Tokyo, Bunkyo, Tokyo, 113-0033, Japan; Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
推荐引用方式 GB/T 7714	Inoue H.,Suehiro S.,Ohta K.,et al. Resistivity saturation of hcp Fe-Si alloys in an internally heated diamond anvil cell: A key to assessing the Earth's core conductivity[J],2020,543.
APA	Inoue H.,Suehiro S.,Ohta K.,Hirose K.,&Ohishi Y..(2020).Resistivity saturation of hcp Fe-Si alloys in an internally heated diamond anvil cell: A key to assessing the Earth's core conductivity.Earth and Planetary Science Letters,543.
MLA	Inoue H.,et al."Resistivity saturation of hcp Fe-Si alloys in an internally heated diamond anvil cell: A key to assessing the Earth's core conductivity".Earth and Planetary Science Letters 543(2020).