Intercalation of fullerite C60 with N2 molecules. An investigation by x-ray powder diffraction

Анотація

The lattice parameter a of fullerite C₆₀ intercalated with N₂ molecules is investigated in the temperature interval 6-295 K by x-ray diffraction. It is found that the interstitial molecular N₂ has a considerable effect on both the temperatures, T_c of the orientational phase transition and T_g of the orientational glass formation. Hysteresis of a(T) has been detected in the T_c and T_g regions, besides, the abrupt change in the volume over the region defining T_c. Complete intercalation of C₆₀₂ molecules results in a 0.2% increase in the lattice parameter, which persists over the whole temperature range. Evidence is also obtained that the interstitial guest molecular N₂ induces a slight deformation of the cubic symmetry of the host C₆₀ lattice.