Abstract
RECENT breakthroughs1,2 in synthesizing large amounts of C60, C70 and other fullerenes3 have made possible studies of the struc-tures and properties of fullerene crystals. Using a force field developed recently for sp2 carbon atoms, we predict here the crystal structures and cohesive energies for close-packed crystals of C60 and C70. We predict, and confirm from calculations, that for C60 face-centred cubic (f.c.c.) packing is more stable than hexagonal close-packing (h.c.p.), by 0.90 kcal mol−1, whereas for C70 h.c.p. is more stable than f.c.c. by 0.35 kcal mol−1. The cubic structure of C60 undergoes an orthorhombic distortion to space group Cmca at 0 K. At higher temperatures there is rapid reorientation (but not free rotation) of C60 molecules, suggesting that above about 200 K a phase transition occurs to an orientationally disordered, f.c.c. structure (with a room-temperature lattice parameter of 14.13 Å). This may correspond to the first-order transition observed4 at 249 K. The threefold axes of the C60 molecules in the low-temperature structure are not aligned with the threefold crystallographic axes.
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Quo, Y., Karasawa, N. & Goddard, W. Prediction of fullerene packing in C60 and C70 crystals. Nature 351, 464–467 (1991). https://doi.org/10.1038/351464a0
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DOI: https://doi.org/10.1038/351464a0
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