Novel crystalline carbon-cage structure synthesized from laser-driven shock wave loading of graphite
We report a novel crystalline carbon-cage structure synthesized from laser-driven shock wave loading of a graphite-copper mixture to about 14±2 GPa and 1000±200 K. Quite unexpectedly, it can be structurally related to an extremely compressed three-dimensional C60 polymer with random displacement of C atoms around average positions equivalent to those of distorted C60 cages. Thus, the present carbon-cage structure represents a structural crossing point between graphite interlayer bridging and C60 polymerization as the two ways of forming diamond from two-dimensional and molecular carbon.
©2005 American Institute of Physics (Received 14 March 2005; accepted 20 May 2005; published online 18 July 2005) One of the authors S.N.L. was sponsored by a Director's Postdoctoral Fellowship at LANL. We are grateful for the invaluable support from the Trident laser facility/staff and the Inertial Confinement Fusion program at LANL. Another author (O.T.) acknowledges support by the NNSA Cooperative Agreement No. DE-FC88-01NV14049. Use of the HPCAT facility at APS was supported by DOE-BES, DOENNSA, NSF, DOD-TACOM, and the W. M. Keck Foundation. APS at Argonne National Laboratory is a national synchrotron-radiation light source research facility funded by the U.S. Department of Energy under Contract No. W-31-109-ENG-38. This work was performed in part under the auspices of U.S. Department of Energy under Contract No. W-7405-ENG-36.