It was recalled that previous experiments on the chemical lithiation of this, and similar, materials had revealed the room-temperature formation of so-called 124 from 123. A simple ionic model was used here in order to estimate the activation energy for Li motion. The result was in good agreement with experimental values which had been deduced from conductivity measurements. It seemed that Li diffusion was favored in 124, as compared with 123. This difference was explained in terms of the structures of the phases.

U.Amador, A.Várez, E.Morán, M.A.Alario-Franco: Solid State Ionics, 1993, 63-65, 518-22