Protonic conduction in this type of H-bonded material was studied by means of measurements of the proton nuclear magnetic resonance lineshape and of the decay of the nuclear magnetic resonance transverse nuclear spin magnetization of 87Rb in a spatially inhomogeneous electric field gradient. A large difference was observed in the time-scales of the decays of the Hahn spin-echo and the Carr-Purcell echo train. The Hahn echo decay curves exhibited an exponential decay; with the time-exponent being proportional to the value of 3 that was characteristic of diffusive motions. The proton nuclear magnetic resonance spectrum demonstrated the presence of mobile protons which produced a motionally narrowed absorption line above 220K.

Protonic Conductivity in the KH2PO4 Family Studied by NMR. J.Dolinsek, M.Karayanni, G.Papavassiliou: Solid State Ionics, 1999, 125[1-4], 159-62