Abstract
To investigate the polymerization of fullerenes, solid and have been subjected simultaneously to high pressures and temperatures, with pressures up to 7.5 GPa and temperatures up to 800 °C. X-ray-diffraction measurements indicate that the fcc solid transforms to an orthorhombic structure consisting of a polymerized linear chain of molecules. The associated changes in the intramolecular vibrational modes have been probed through Raman and infrared measurements. In contrast to solid , under similar conditions, polymerization is not observed in the case of solid , although there is a structural transition from the initial hcp structure to a rhombohedral structure. This lack of polymerization in is discussed in terms of the structure of solid under high pressure and temperature conditions, coupled with the topochemical features of the molecule. © 1996 The American Physical Society.
- Received 7 December 1995
DOI:https://doi.org/10.1103/PhysRevB.53.8180
©1996 American Physical Society