Crystallization and phase transitions in C60

Abstract
C60 fullerites were condensed from solution using various techniques. The phase transitions were monitored by derivative scanning calorimetry measurements performed in various gases. Two phase transitions were observed in C60 crystals at 245 and 260 K. The low temperature one results from the molecules’ reorientation in the lattice and disappears for poorly crystallized material. The high temperature one is observed in all samples and results from molecules libration. The gas dissolved in C60 crystals strongly influences observed phase transitions.