The X-ray phase analysis C-60 fullerene

Analysis of the X-ray diffraction spectra of seven C-60 fullerene samples s howed the presence of three phases. The crystalline component has an imperf ect structure with a pseudohexagonal or pseudocubic cell. For the first tim e, the presence of two amorphous phases was revealed. One represents the af orementioned crystalline phase but has a small crystallite size (L = 40-20 Angstrom). and the other is due to the presence of lone C-60 molecules that are not bound to the crystalline component. These molecules are characteri zed by two broad halos (Delta (1) = 7.5 degrees theta, Delta (2) = 13 degre es theta). The quantitative X-ray phase analysis of some C-60 samples was p erformed. and changes in their phase composition upon IR heating up to 500 degreesC were studied.