Abstract
The microstructure of the C60/carbon nanotube composite produced at a pressure of 5.5GPa at 1073K wasexamined by X-ray diffraction (XRD) and high resolution electron microscopy (HRTEM). The XRD profile froma compaction surface indicated that C60 matrix changed into a polymerized phase which can be indexed as fcc structure (a =1.31 nm). On a cross-sectional area of the specimen and the crushed specimen, however, the XRD profiles andthe HRTEM observation suggested that the polymerized structure was approximated as the rhombohedral structure. The structural orientation of the bulk specimen and handling of the specimen (bulk or powder) should be taken intoaccount in structural characterization of high pressure polymerized C60. In the nanotubes, no obvious change in the structureis observed even after high-pressure compaction except for a partial collapse.
