Nuclear magnetic resonance studies of Br and Ag in the superionic conductor were carried out at pressures of up to 7kbar. The temperature dependence of the Ag spin-lattice relaxation at constant pressure was analyzed in terms of 2 thermally activated contributions which were related to Ag ion diffusion jumps. The deduced activation energies and Ag hopping rates at 1bar agreed with conductivity measurements. Pressure-dependent relaxation gave negative activation volumes of -7.5cm3/mol at 6kbar. Diffusion coefficients calculated from conductivity data were compared with those determined using the pulsed magnetic field gradient method. This suggested a Haven ratio of about unity for temperatures of between 0 and 60C.

H.Huber, M.Mali, J.Roos, D.Brinkmann: Solid State Ionics, 1986, 18-19, 1188-92