In-plane jump diffusion of Li inLiC6

Li diffusion in ${\mathrm{LiC}}_6$ has been measured by high-resolution neutron spectroscopy both in the ordered phase between 630 and 675 K and in the disordered phase at 720 K. The in-plane diffusion constant D at 660 K is 1×${10}^{\mathrm{-}6}$ ${\mathrm{cm}}^2$/s, which increases to 24×${10}^{\mathrm{-}6}$ ${\mathrm{cm}}^2$/s above ${\mathrm{T}}_{\mathrm{c}}$. At all temperatures, a jump-type diffusion mechanism was observed, with jump vectors connecting nearest Li-sublattice sites in the ordered phase, but nearest hexagon centers in the disordered phase.