Intercalation of molecular gases into C-60 - art. no. 205417

The intercalation of N-2 into solid C-60 has been studied by high-resolutio n dilatometry, neutron diffraction, and quasielastic neutron scattering. Fa vored by weak binding forces between C-60 molecules in the bulk, N-2(O-2) m olecules trapped on octahedral sites of the host lattice are found to cause significant structural changes. Thermal expansion of bulk samples as well as peculiarities in the molecular ordering are followed over a wide range o f temperatures and compared to pristine C-60. Rotational diffusion and the inelastic excitation spectra of guest and host molecules that had been stud ied in detail in a previous paper [B. Renker et al., Phys. Rev. B. 61, 13 9 60 (2000)] are brought in relation to the structural results. In addition, results of magnetic excitations in paramagnetic O2C60 are presented.