Chemistry and Physics of Minerals and Rocks/Volcanology

Intercomparison of pressure standards (Au, Pt, Mo, MgO, NaCl and Ne) to 2.5 Mbar

  1. S. M. Dorfman1,2,*,
  2. V. B. Prakapenka3,
  3. Y. Meng4,
  4. T. S. Duffy1

Article first published online: 30 AUG 2012

DOI: 10.1029/2012JB009292

Issue

Journal of Geophysical Research: Solid Earth (1978–2012)

Journal of Geophysical Research: Solid Earth (1978–2012)

Additional Information

How to Cite

Dorfman, S. M., V. B. Prakapenka, Y. Meng, and T. S. Duffy (2012), Intercomparison of pressure standards (Au, Pt, Mo, MgO, NaCl and Ne) to 2.5 Mbar, J. Geophys. Res., 117, B08210, doi:10.1029/2012JB009292.

Author Information

  1. 1

    Department of Geosciences, Princeton University, Princeton, New Jersey, USA

  2. 2

    Now at Earth and Planetary Science Laboratory, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

  3. 3

    Consortium for Advanced Radiation Sources, University of Chicago, Argonne, Illinois, USA

  4. 4

    High-Pressure Collaborative Access Team, Carnegie Institution of Washington, Argonne, Illinois, USA

*Corresponding author: S. M. Dorfman, Earth and Planetary Science Laboratory, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland. (susannah.dorfman@epfl.ch)

Publication History

  1. Issue published online: 30 AUG 2012
  2. Article first published online: 30 AUG 2012
  3. Manuscript Accepted: 12 JUL 2012
  4. Manuscript Revised: 30 JUN 2012
  5. Manuscript Received: 8 MAR 2012
Corrected by:

Chemistry and Physics of Minerals and Rocks/Volcanology: Correction to “Intercomparison of pressure standards (Au, Pt, Mo, MgO, NaCl and Ne) to 2.5 Mbar”

Vol. 117, Issue B11, Article first published online: 14 NOV 2012

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Keywords:

  • Mbar;
  • differential stress;
  • equation of state;
  • pressure calibration

[1] We have performed a series of co-compression experiments on Au, Pt, Mo, MgO and NaCl to extend internally consistent pressure calibration and characterize shear strength of pressure media to 2.5 Mbar. Measured unit cell volumes of calibrants show differences between existing pressure scales of ∼10% above 2 Mbar. A new comprehensive pressure scale is proposed in good agreement with recent reduced shock isotherms for Au, Mo and Pt and with internal agreement to 3% at Mbar pressures. Deviatoric stresses were analyzed for each material based on diffraction line broadening and line shifts due to anisotropic strain. The measured strength of Ne at 2.5 Mbar is 8 GPa. Diffraction line width analysis suggests that deviatoric stress conditions at 2.5 Mbar are similar for He and Ne media.

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