Bonding changes in compressed superhard graphite.

  title={Bonding changes in compressed superhard graphite.},
  author={Wendy L. Mao and Ho-kwang Mao and Peter J. Eng and Thomas P. Trainor and M Newville and Chi-chang Kao and Dion L. Heinz and Jinfu Shu and Yue Meng and Russell J. Hemley},
  volume={302 5644},
Compressed under ambient temperature, graphite undergoes a transition at approximately 17 gigapascals. The near K-edge spectroscopy of carbon using synchrotron x-ray inelastic scattering reveals that half of the pi-bonds between graphite layers convert to sigma-bonds, whereas the other half remain as pi-bonds in the high-pressure form. The x-ray diffraction pattern of the high-pressure form is consistent with a distorted graphite structure in which bridging carbon atoms between graphite layers… CONTINUE READING
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