Polymerization and pressure-induced amorphization of C60 and C70

Rao, C. N. R. ; Govindaraj, A. ; Aiyer, Hemantkumar N. ; Seshadri, Ram (1995) Polymerization and pressure-induced amorphization of C60 and C70 Journal of Physical Chemistry, 99 (46). pp. 16814-16816. ISSN 0022-3654

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100046a003

Related URL: http://dx.doi.org/10.1021/j100046a003


Scanning tunneling microscopy of solid films of C-60 and C-70 clearly demonstrate the occurrence of photochemical polymerization of these fullerenes in the solid state. X-ray diffraction studies show that such a polymerization is accompanied by contraction of the unit-cell volume in the case of C-60 and expansion in the case of C-70. This is also evidenced from the STM images. These observations help to understand the differences in the amorphization behavior of C-60 and C-70 under pressure. Amorphization of C-60 under pressure is irreversible because it is accompanied by polymerization associated with a contraction of the unit cell volume. Monte Carlo simulations show how pressure-induced polymerization is favored in C-60 because of proper orientation as well as the required proximity of the molecules. Amorphization of C-70, on the other hand, is reversible because C-70 is less compressible and polymerization is not favored under pressure.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:43501
Deposited On:11 Jun 2011 14:00
Last Modified:11 Jun 2011 14:00

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