Differential scanning calorimetry revealed a secondary transition at a lower temperature besides the order-disorder phase transition near 260K in powders,not in single crystals,of C_(60) from which solvents and impuri...Differential scanning calorimetry revealed a secondary transition at a lower temperature besides the order-disorder phase transition near 260K in powders,not in single crystals,of C_(60) from which solvents and impurities had been carefully excluded.This is attributed to phase transformation facilitated by nucleation around stacking faults.This proposal is supported by internal friction measurements on films,which confirmed the presence of this secondary transition,and by x-ray diffraction,which detected an hcp structure within the fcc lattice of C_(60) at room temperature.展开更多
基金Supported by the Natural Science Foundation of Jiangsu Province under Grand No.BK97224Hong Kong Baptist University.
文摘Differential scanning calorimetry revealed a secondary transition at a lower temperature besides the order-disorder phase transition near 260K in powders,not in single crystals,of C_(60) from which solvents and impurities had been carefully excluded.This is attributed to phase transformation facilitated by nucleation around stacking faults.This proposal is supported by internal friction measurements on films,which confirmed the presence of this secondary transition,and by x-ray diffraction,which detected an hcp structure within the fcc lattice of C_(60) at room temperature.
