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Physical Review B 76 (2007) 155403
Transformation of graphite into nanodiamond following extreme electronic excitations
A. Dunlop1, G. Jaskierowicz1, P. M. Ossi, S. Della Negra2

Graphite targets have been irradiated at 90 K and 300 K with 850 MeV and 6 GeV lead ions and with 20–30 MeV fullerene cluster ions in a large range of fluences. Damage creation was studied both by transmission electron microscopy and Raman spectroscopy. The very strong energy density deposited in electronic processes generates a highly excited region around the projectile path. The relaxation of the deposited energy via hydrodynamic expansion and shock-wave propagation leads to the formation of small defective graphitic domains and of nanocrystalline diamond particles.
1 :  LSI - UMR 7642 - Laboratoire des Solides Irradiés
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
Physique/Physique Nucléaire Expérimentale