Specimens were studied by using magic-angle-spinning nuclear magnetic resonance techniques. The 1D results revealed three Li resonances, which were attributed to various crystallographic sites. An extra peak appeared at low temperatures, thus indicating the charge ordering of Mn3+ and Mn4+. Direct monitoring of the Li dynamics was possible by using rotor-synchronized 2D exchange nuclear magnetic resonance. A ms-timescale exchange of Li began, at about 285K, between the 8a and 16c sites. At 380K, the Li even began to hop between more than 2 sites. The activation energies and Li jump rates were deduced, and were found to agree with those determined macroscopically.

Lithium Dynamics in Mn2LiO4 Probed Directly by Two-Dimensional 7Li NMR. V.W.J.Verhoeven, I.M.De Schepper, G.Nachtegaal, A.P.M.Kentgens, E.M.Kelder, J.Schoonman, F.M.Mulder: Physical Review Letters, 2001, 86[19], 4314-7