Open AccessIntercomparison of pressure standards (Au, Pt, Mo, MgO, NaCl and Ne) to 2.5 Mbar
Author(s) -
Dorfman S. M.,
Prakapenka V. B.,
Meng Y.,
Duffy T. S.
Publication year - 2012
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2012jb009292
Subject(s) - materials science , anisotropy , compression (physics) , diffraction , line (geometry) , shock (circulatory) , analytical chemistry (journal) , composite material , optics , chemistry , physics , geometry , mathematics , chromatography , medicine
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.