Abstract
X-ray scattering was used to study thin films of C[sub 60] on mica. Sodium intercalation into C[sub 60] yields Na[sub x]C[sub 60], with Na[sub 6]C[sub 60] retaining the fcc structure of undoped C[sub 60]. The fcc domain was extended up to x = 10. Metallic and superconducting donor-type intercalation compounds of C[sub 60] are now well established; C[sub 60]I[sub 4] was obtained with no superconductivity above 4 K. Isothermal compressibility of K[sub 3]C[sub 60] and Rb[sub 3]C[sub 60] was measured and used to establish a universal first-order relation between [Tc] and lattice parameter a. Inelastic neutron scattering of inter- and intrachain dynamics of polyacetylene, polyaniline, and poly-parapheylene-vinylene reveal differences in the dominant thermal excitations.
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