A DOUBLE-TEMPERATURE-GRADIENT TECHNIQUE FOR THE GROWTH OF PURE C-60 SINGLE-CRYSTALS FROM THE VAPOR-PHASE

Pure C60 single crystals were grown by a sublimation-condensation meth od in an evacuated closed quartz tube situated in a double-temperature -gradient furnace. Large C60 single crystals, up to a size of 0.6 mm x 1.0 mm x 2.0 mm with quite smooth and shiny faces, were obtained. X-r ay diffraction, electron diffraction and X-ray morphology were carried out and showed that the quality of large C60 single crystals grown by the double-temperature-gradient technique is excellent. In this paper the experimental results of the growth of large C60 single crystals a re reported and the morphological and structural characterizations are discussed in detail.