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Title: Ramp compression of iron to 273 GPa

Abstract

Multiple thickness Fe foils were ramp compressed over several nanoseconds to pressure conditions relevant to the Earth’s core. Using wave-profile analysis, the sound speed and the stress-density response were determined to a peak longitudinal stress of 273 GPa. The measured stress-density states lie between shock compression and 300-K static data, and are consistent with relatively low temperatures being achieved in these experiments. Phase transitions generally display time-dependent material response and generate a growing shock. We demonstrate for the first time that a low-pressure phase transformation (α-Fe to ε-Fe) can be overdriven by an initial steady shock to avoid both the time-dependent response and the growing shock that has previously limited ramp-wave-loading experiments. Additionally, the initial steady shock pre-compresses the Fe and allows different thermodynamic compression paths to be explored.

Authors:
 [1];  [2];  [2];  [2];  [3];  [2];  [2];  [4];  [2];  [1]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Rochester, Rochester, NY (United States)
  4. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1337784
Grant/Contract Number:  
NA0002154
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 114; Journal Issue: 2; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wang, Jue, Smith, Raymond F., Eggert, Jon H., Braun, Dave G., Boehly, Thomas R., Patterson, J. Reed, Celliers, Peter M., Jeanloz, Raymond, Collins, Gilbert W., and Duffy, Thomas S. Ramp compression of iron to 273 GPa. United States: N. p., 2013. Web. doi:10.1063/1.4813091.
Wang, Jue, Smith, Raymond F., Eggert, Jon H., Braun, Dave G., Boehly, Thomas R., Patterson, J. Reed, Celliers, Peter M., Jeanloz, Raymond, Collins, Gilbert W., & Duffy, Thomas S. Ramp compression of iron to 273 GPa. United States. doi:10.1063/1.4813091.
Wang, Jue, Smith, Raymond F., Eggert, Jon H., Braun, Dave G., Boehly, Thomas R., Patterson, J. Reed, Celliers, Peter M., Jeanloz, Raymond, Collins, Gilbert W., and Duffy, Thomas S. Thu . "Ramp compression of iron to 273 GPa". United States. doi:10.1063/1.4813091. https://www.osti.gov/servlets/purl/1337784.
@article{osti_1337784,
title = {Ramp compression of iron to 273 GPa},
author = {Wang, Jue and Smith, Raymond F. and Eggert, Jon H. and Braun, Dave G. and Boehly, Thomas R. and Patterson, J. Reed and Celliers, Peter M. and Jeanloz, Raymond and Collins, Gilbert W. and Duffy, Thomas S.},
abstractNote = {Multiple thickness Fe foils were ramp compressed over several nanoseconds to pressure conditions relevant to the Earth’s core. Using wave-profile analysis, the sound speed and the stress-density response were determined to a peak longitudinal stress of 273 GPa. The measured stress-density states lie between shock compression and 300-K static data, and are consistent with relatively low temperatures being achieved in these experiments. Phase transitions generally display time-dependent material response and generate a growing shock. We demonstrate for the first time that a low-pressure phase transformation (α-Fe to ε-Fe) can be overdriven by an initial steady shock to avoid both the time-dependent response and the growing shock that has previously limited ramp-wave-loading experiments. Additionally, the initial steady shock pre-compresses the Fe and allows different thermodynamic compression paths to be explored.},
doi = {10.1063/1.4813091},
journal = {Journal of Applied Physics},
number = 2,
volume = 114,
place = {United States},
year = {2013},
month = {7}
}

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Cited by: 18 works
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