Science Advances

Supplementary Materials

This PDF file includes:

  • fig. S1. Images demonstrating comparative hardness of NCD, single-crystal diamond, and NPD.
  • fig. S2. Raman spectra collected from the diamond anvil over the tip of a semiball and at its edge.
  • fig. S3. Reflectance IR spectra collected through and beside an NCD semiball compressed in a LiF medium at the IR2 beamline at ANKA Synchrotron.
  • fig. S4. Variations of the lattice parameters of gold (red circles) and NCD of secondary anvils (blue squares) as functions of the pressure in the chamber.
  • fig. S5. Optical photograph of the sample (Au and paraffin wax) compressed in a gasketed ds-DAC at 688(10) GPa, as seen through the diamonds and NCD secondary anvils.
  • table S1. Observed and calculated d spacing of Au at 1065(15) GPa.

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