Shock compressing diamond to a conducting fluid.

@article{Bradley2004ShockCD,
  title={Shock compressing diamond to a conducting fluid.},
  author={D. K. Bradley and Jon H. Eggert and D. G. Hicks and Peter M. Celliers and Stephen John Moon and Robert C. Cauble and Gilbert W. Collins},
  journal={Physical review letters},
  year={2004},
  volume={93 19},
  pages={
          195506
        }
}
Laser generated shock reflectance data show that diamond undergoes a continuous transition from optically absorbing to reflecting between Hugoniot pressures 600<P(H)<1000 GPa. The data are consistent with diamond having a thermal population of carriers at P(H) approximately 600 GPa, undergoing band overlap metallization at P(H) approximately 1000 GPa and melting at 800<P(H)<1000 GPa. The results agree well with an equation of state model that predicts that elemental carbon remains solid… 

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TLDR
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