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Title: Ramp compression of iron to 273 GPa

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4813091· OSTI ID:1337784
 [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)

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.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002154
OSTI ID:
1337784
Journal Information:
Journal of Applied Physics, Vol. 114, Issue 2; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Cited By (7)

Equation of state of iron under core conditions of large rocky exoplanets journal April 2018
The α→ϵ phase transition in iron at strain rates up to ∼10 9  s −1 journal March 2014
From microjoules to megajoules and kilobars to gigabars: Probing matter at extreme states of deformation journal September 2015
Direct calculation of sound speed of materials under ramp wave compression journal November 2018
Improved embedded-atom model potentials of Pb at high pressure: application to investigations of plasticity and phase transition under extreme conditions journal November 2018
Generation and characterisation of warm dense matter with intense lasers journal November 2017
Crystal structure and equation of state of Fe-Si alloys at super-Earth core conditions journal April 2018

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