R.C. Haddon, A.F. Hebard, M.J. Rosseinsky, D.W. Murphy, et al., "Conducting films of C60 and C70 by alkali-metal doping," Nature, 350:320-22, 1991.

Robert Haddon (AT&T Bell Laboratories, Murray Hill, N.J.): "This was the first report of the solid-state doping of C60 and C70 to produce alkali metal fullerides. C60 and C70 films underwent doping with the alkali metals to produce conductors. The doped C60 films gave rise to conductivities comparable to those observed in n-type doped polyacetylene. The conductivity was construed to arise from the population of C60 p-orbitals, which hybridize together to produce a conduction band in the solid. The face-centered cubic (FCC) structure of C60 has a lattice with sufficient size to accommodate most of the alkali metals in the interstitial sites without unduly inhibiting the intermolecular C60 contacts.

"The FCC C60 lattice can accommodate a maximum of three alkali metal dopants per C60 molecules, thus allowing for...

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