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The temperature dependences of the heat capacity Cp° = f(T) were studied in an adiabatic vacuum calorimeter for the orthorhombic, tetragonal, and rhombohedral polymeric C60 phases in the 7—340 K temperature interval with an error of ∼0.2%. Comparative analysis of Cp° of these phases formed by stacking of one-dimensional and two types of two-dimensional polyfullerenes C60, was performed, and their...
Raman spectroscopy, X-ray and electron diffractions have been applied to study samples of fullerene C 60 after they have undergone pressure and temperature treatments up to 8 GPa and 1073 K. It is confirmed that mixtures of rhombohedral and tetragonal structures are formed in the 2-4 GPa and 673-1073 K pressure-temperature domain. Traces of a hexagonal phase are also observed in the...
Samples of fullerene C 60 submitted previously to temperatures and pressures up to 973 K and 9.5 GPa have been heated in a differential scanning calorimeter in the interval 220-725 K. In nearly all of them, the first heating showed an irreversible endothermic peak extending between 450 and 550 K which was interpreted as a depolymerization reaction. Subsequent heating of the resulting...
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