Thermal decomposition of C
60 was studied by x-ray diffraction and time-of-flight mass spectroscopy, which was carried out in a high-purity argon gas for 3h at the temperature ranging from 500 to 1000°C. The diffraction peaks corresponding to C
60 of cubic system were detected in the samples heated below 500°C. With the increase of temperature, these peaks of C
60 were broadened, and the diffraction peaks corresponding to chaoite of hexagonal system were detected. From time-of-flight spectroscopy, it was found that two molecules of C
22 and C
48 were produced by heating C
60 at 600°C, though not resolved C
60 remained. The decomposition of C
60 advanced with the increase of temperature. At 1000°C, it was found that C
60 was decomposed into five molecules, such as C
9, C
22, C
25, C
35 and C
48.
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