Polymerization and pressure-induced amorphization of C{sub 60} and C{sub 70}
- Indian Inst. of Science, Bangalore (India)
Scanning tunneling microscopy of solid films of C{sub 60} and C{sub 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{sub 60} and expansion in the case of C{sub 70}. This is also evidenced from the STM images. These observations help to understand the differences in the amorphization behavior of C{sub 60} and C{sub 70} under pressure. Amorphization of C{sub 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{sub 60} because of proper orientation as well as the required proximity of the molecules. Amorphization of C{sub 70}, On the other hand, is reversible because C{sub 70} is less compressible and polymerization is not favored under pressure. 10 refs., 3 figs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 159677
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 46 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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