H and Li dynamics in Li12C60and Li12C60Hy

none9siLithium and hydrogen dynamics in Li12C60and Li12C60Hyare investigated by means of7Li and1H solid state Nuclear Magnetic Resonance (NMR) in the temperature range 80â550 K. Differential scanning calorimetry characterization on the hydrogen sorption and X-rays structural analysis are also reported. In the pure phase, the7Li results show a thermally activated dynamics that can be associated to Li motions within the crystal interstices. Upon hydrogenation, Li ionic motion is considerably hindered by the presence of hydrofullerene molecules. The1H measurements show that CâH bonds are stable on the local scale up to 400â450 K. The NMR results at higher temperatures are compatible with a H diffusion mechanism which anticipates the H desorption process.mixedSarzi AmadÃ, N.; Gaboardi, M.; Magnani, G.; Riccã², M.; Pontiroli, D.; Milanese, C.; Girella, A.; Carretta, P.; Sanna, SamueleSarzi AmadÃ, N.; Gaboardi, M.; Magnani, G.; Riccã², M.; Pontiroli, D.; Milanese, C.; Girella, A.; Carretta, P.; Sanna, Samuel