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DOI	10.1029/2020JB020008
	Equation of State Measurements on Iron Near the Melting Curve at Planetary Core Conditions by Shock and Ramp Compressions
	Grant S.C.; Ao T.; Seagle C.T.; Porwitzky A.J.; Davis J.-P.; Cochrane K.R.; Dolan D.H.; Lin J.-F.; Ditmire T.; Bernstein A.C.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The outer core of the Earth is composed primarily of liquid iron, and the inner core boundary is governed by the intersection of the melt line and the geotherm. While there are many studies on the thermodynamic equation of state for solid iron, the equation of state of liquid iron is relatively unexplored. We use dynamic compression to diagnose the high-pressure liquid equation of state of iron by utilizing the shock-ramp capability at Sandia National Laboratories’ Z-Machine. This technique enables measurements of material states off the Hugoniot by initially shocking samples and subsequently driving a further, shockless compression. Planetary studies benefit greatly from isentropic, off-Hugoniot experiments since they can cover pressure-temperature (P-T) conditions that are close to adiabatic profiles found in planetary interiors. We used this method to drive iron to P-T conditions similar to those of the Earth’s outer-inner core boundary, along an elevated-temperature isentrope in the liquid from 275 GPa to 400 GPa. We derive the equation of state using a hybrid backward integration – forward Lagrangian technique on particle velocity traces to determine the pressure-density history of the sample. Our results are in excellent agreement with SESAME 92141, a previously published equation of state table. With our data and previous experimental data on liquid iron we provide new information on the iron melting line and derive new parameters for a Vinet-based equation of state. The table and our parameterized equation of state are applied to provide an updated means of modeling the pressure, mass, and density of liquid iron cores in exoplanetary interiors. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	equation of state; iron; planets
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/187298
作者单位	Center for High Energy Density Science, The University of Texas at Austin, Austin, TX, United States; Sandia National Laboratories, Albuquerque, NM, United States; Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	Grant S.C.,Ao T.,Seagle C.T.,et al. Equation of State Measurements on Iron Near the Melting Curve at Planetary Core Conditions by Shock and Ramp Compressions[J],2021,126(3).
APA	Grant S.C..,Ao T..,Seagle C.T..,Porwitzky A.J..,Davis J.-P..,...&Bernstein A.C..(2021).Equation of State Measurements on Iron Near the Melting Curve at Planetary Core Conditions by Shock and Ramp Compressions.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Grant S.C.,et al."Equation of State Measurements on Iron Near the Melting Curve at Planetary Core Conditions by Shock and Ramp Compressions".Journal of Geophysical Research: Solid Earth 126.3(2021).