STRUCTURAL STUDY ON C-60 MATERIAL

The crystal structure and defect structures of C60 material have been studied by means of X-ray diffraction, high-resolution electron microscopy and electron diffraction. The diffraction measurements show that the C60 Crystal has the face-centered cubic (fcc) structure with lattice parameter a = 1.42 nm. High-resolution electron microscopy observations, combined with the analyses of selected area electron diffraction, indicate that the coherent twins situated in the {1 1 1} planes frequently appear in the C60 crystal. The disordered stacking along the [1 1 1] direction and other kinds of defects appearing in the new material have also been investigated. Upon in situ cooling and heating from 130 K to 700 K, the structural stability of the C60 Crystal has been observed.