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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