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Title: Polymerization and Pressure-Induced Amorphization of C60 and C70
Authors: Rao, C N R
Govindaraj, A
Aiyer, Hemantkumar N
Seshadri, Ram
Keywords: Solid C-60
Issue Date: 16-Nov-1995
Publisher: American Chemical Society
Citation: Journal of Physical Chemistry 99(46), 16814-16816 (1995)
Abstract: 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.
Description: Letter. Restricted Access.
Other Identifiers: 0022-3654
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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