Abstract
C60-C70 solids were prepared via volatilization of solutions of C60 and C70 in toluene as the solvent. During volatilization of the toluene, saturated fullerene molecules did not precipitate as a C60-C70 solid, but formed a single phase (C60)1−x(C70)x•C6H5CH3 solvate. The solvate was unstable in air when x was small and naturally decomposed into a C60-C70 solid. With heat-treatment in a vacuum, the solvate could also be converted into the C60-C70 solid even when x was large. The single solvate phase produced two phases of C60-C70 solids, indicating that the C60-C70 system possesses a miscibility gap.
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