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Related Experiment Videos

Bonding changes in compressed superhard graphite.

Wendy L Mao1, Ho-kwang Mao, Peter J Eng

  • 1Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA. wmao@chicago.edu

Science (New York, N.Y.)
|October 18, 2003
PubMed
Summary
This summary is machine-generated.

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Under high pressure, graphite transforms into a superhard material. This structural change involves converting pi-bonds to sigma-bonds, creating a material harder than diamond.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Graphite, a common allotrope of carbon, exhibits unique electronic and structural properties.
  • Understanding pressure-induced phase transitions is crucial for developing novel materials with enhanced properties.

Purpose of the Study:

  • To investigate the structural and bonding changes in graphite under high pressure.
  • To characterize the properties of the high-pressure phase of graphite.

Main Methods:

  • Compression of graphite under ambient temperature up to 17 gigapascals.
  • Near K-edge spectroscopy of carbon using synchrotron x-ray inelastic scattering.
  • X-ray diffraction analysis of the high-pressure phase.

Main Results:

Related Experiment Videos

  • Graphite transforms at approximately 17 gigapascals.
  • Half of the pi-bonds convert to sigma-bonds, while the other half remain as pi-bonds.
  • The high-pressure form exhibits a distorted graphite structure and is superhard, capable of indenting diamond.

Conclusions:

  • High-pressure compression induces a significant structural and bonding transformation in graphite.
  • The resulting superhard phase holds potential for applications requiring extreme hardness and durability.