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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Establishing gold and platinum standards to 1 terapascal using shockless compression.

D E Fratanduono1, M Millot2, D G Braun2

  • 1Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. fratanduono1@llnl.gov.

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Researchers developed new pressure standards for high-pressure physics using shockless compression experiments. This advances understanding of material behavior under extreme conditions, crucial for condensed-matter theory and numerical methods.

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Area of Science:

  • High-pressure physics
  • Condensed-matter physics
  • Materials science

Background:

  • Advancing high-pressure physics beyond 1 terapascal presents challenges in accurately determining pressure states.
  • Well-calibrated pressure-density reference materials are essential for validating theoretical models and numerical methods in extreme conditions.

Purpose of the Study:

  • To establish quasi-absolute, high-precision, pressure-density equation-of-state data for gold and platinum.
  • To derive experimentally constrained pressure standards reaching terapascal conditions.
  • To improve the connection between experimental data and theoretical predictions in high-pressure regimes.

Main Methods:

  • Shockless dynamic compression experiments were performed at the National Ignition Facility and the Z machine.
  • Equation-of-state data for gold and platinum were collected under dynamic compression.
  • Analysis focused on deriving precise pressure-density relationships.

Main Results:

  • Quasi-absolute, high-precision pressure-density equation-of-state data for gold and platinum were obtained.
  • Two experimentally constrained pressure standards were successfully derived up to terapascal conditions.
  • The results provide crucial reference points for high-pressure research.

Conclusions:

  • The derived pressure standards enhance the accuracy of high-pressure measurements.
  • Improved experimental data facilitate rigorous testing of condensed-matter theory and numerical simulations.
  • This work contributes to a better understanding of material responses under extreme pressures.