High-precision measurements of the diamond Hugoniot in and above the melt region

D. G. Hicks*, T. R. Boehly, P. M. Celliers, D. K. Bradley, J. H. Eggert, R. S. McWilliams, R. Jeanloz, G. W. Collins

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

High-precision measurements of the diamond principal Hugoniot have been made at pressures between 6 and 19 Mbar. Shock velocities were determined with 0.3%-1.1% precision using a velocity interferometer. Impedance-matching analysis, incorporating systematic uncertainties in the equation of state of the quartz standard, was used to determine the Hugoniot with 1.2%-2.7% precision in density. The results are in good agreement with published ab initio calculations, which predict a small negative melt slope along the Hugoniot, but disagree with previous laser-driven shock wave experiments, which had observed a large density increase in the melt region. In the extensive solid-liquid coexistence regime between 6 and 10 Mbar, the present measurements indicate that the mixed phase is a few percent more dense than what would be expected from a simple interpolation between liquid and solid Hugoniots.

Original languageEnglish
Article number174102
Number of pages8
JournalPhysical review B
Volume78
Issue number17
DOIs
Publication statusPublished - Nov 2008

Keywords / Materials (for Non-textual outputs)

  • SHOCK COMPRESSION
  • ELECTRONIC-PROPERTIES
  • PHASE-DIAGRAM
  • CARBON
  • INTERFEROMETER
  • PRESSURES
  • GRAPHITE
  • STATE

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