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23 Na-and 13 C-NMR of NaC 60 heat-treated under high-pressure are presented, and the results are compared with those of Li x C 60 polymers. The 13 C-NMR spectra clearly showed the existence of sp 3 carbon atoms, evidencing for the transformation to the C 60 polymer phase. The spin-lattice relaxation time, T 1 , of 13 C-NMR suggested an electron localization effect, and the electronic density of states at the Fermi level at 4.2 K was estimated to be smaller than 0.6 states/eV/C 60 /spin, whichdoi:10.1063/1.1420147 fatcat:dunb5iljw5cahgm4ekv35b7onu