Sound speed and Grüneisen parameter up to three terapascal in shock-compressed iron

This paper presents the first sound speed and Grüneisen parameter data for fluid iron compressed to 3 TPa (30 million atmospheres) and 20 g/cm3 on the Hugoniot. Both the sound speed and Grüneisen parameter are derivatives of the equation of state (EOS), and thus tightly constrain the contours of the...

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Published in:Physical review. B 2024-05, Vol.109 (18)
Main Authors: Huff, M. F., Fratanduono, D. E., Marshall, M. C., McCoy, C. A., Hansen, L. E., Polsin, D. N., Suer, T., Smith, E. A., Henderson, B. J., Gong, X., Collins, G. W., Rygg, J. R.
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Language:English
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CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Equations of state
Extrasolar planets
Shock waves
Warm-dense matter
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container_issue 18
container_start_page
container_title Physical review. B
container_volume 109
creator Huff, M. F.
Fratanduono, D. E.
Marshall, M. C.
McCoy, C. A.
Hansen, L. E.
Polsin, D. N.
Suer, T.
Smith, E. A.
Henderson, B. J.
Gong, X.
Collins, G. W.
Rygg, J. R.
description This paper presents the first sound speed and Grüneisen parameter data for fluid iron compressed to 3 TPa (30 million atmospheres) and 20 g/cm3 on the Hugoniot. Both the sound speed and Grüneisen parameter are derivatives of the equation of state (EOS), and thus tightly constrain the contours of the EOS surface. The sound speed data are systematically lower than expected from a simple extrapolation of previous data. The Grüneisen parameter shows a 30% drop at pressures and temperatures above the melt transition. Furthermore, while some models compare well with either the sound speed or Grüneisen parameter, none of today’s state-of-the-art models can explain both sets of data. Furthermore these new data will provide pivotal benchmarks for both future theoretical EOSs of warm dense iron and modeling planetary states and processes.
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subjects CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Equations of state
Extrasolar planets
Shock waves
Warm-dense matter
title Sound speed and Grüneisen parameter up to three terapascal in shock-compressed iron
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