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Related Experiment Videos

Shock compressing diamond to a conducting fluid.

D K Bradley1, J H Eggert, D G Hicks

  • 1Lawrence Livermore National Laboratory, Livermore, California 94551, USA.

Physical Review Letters
|December 17, 2004
PubMed
Summary

Diamond transitions from absorbing to reflecting under high pressure, indicating metallization and melting. These findings support models of carbon remaining solid within Neptune.

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Area of Science:

  • Materials Science
  • High-Pressure Physics
  • Planetary Science

Background:

  • Understanding the behavior of carbon under extreme pressures is crucial for planetary interior models.
  • Diamond, a form of carbon, exhibits unique properties under shock compression.

Purpose of the Study:

  • To investigate the optical properties of diamond at high pressures.
  • To determine the conditions for metallization and melting of diamond.
  • To inform models of Neptune's internal structure.

Main Methods:

  • Utilized laser-generated shock waves to compress diamond samples.
  • Measured shock reflectance to probe optical transitions.
  • Analyzed data in conjunction with equation of state models.

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Main Results:

  • Observed a continuous transition from optical absorption to reflection between 600-1000 GPa.
  • Data suggest thermal carrier population around 600 GPa.
  • Indicated band overlap metallization near 1000 GPa and melting between 800-1000 GPa.

Conclusions:

  • Diamond undergoes significant electronic and structural changes at extreme pressures.
  • Results align with theoretical predictions of solid carbon in Neptune's interior.