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The thermal behavior of a mixture of fullerites C 60/70 was studied by X ray diffraction and IR and UV spectroscopy. The temperature range in which the molecular and crystal states degrade was determined (825-875°C in a CO medium). In the C 60/70 mixture, fullerenes decomposed at lower temperatures than in pure C 60 and C 70 ; the decomposition temperature depended on the impurity (oxygen and solvent) content.

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Structural changes occurring in C 60 fullerenes after ball-milling processing were studied. The quantitative characteristics of the local atomic configurations were reconstructed by the reverse Monte Carlo method in the structure of pristine and ball-milled fullerenes C 60 , respectively. It is shown that 3-fold atomic rings, indicating complete amorphization of crystalline fullerenes, are dominant in the structure of material after 14 h treatment. The behavior of the distribution of the sphericity coefficient of Voronoi polyhedra validates a gradual structural disordering of molecular crystal of C 60 and, respectively, the formation of amorphous carbon with randomly arranged closepacked structure after continuous ball-milling treatment.