The ionic motion of protons in Y-doped samples of the perovskite was investigated by means of high-temperature H nuclear magnetic resonance and alternating-current conductivity measurements. The temperature dependences of the line-shapes and spin-lattice relaxation times were obtained. The Arrhenius plot exhibited an asymmetrical temperature dependence with respect to its minimum value. It could be described by using the classical Bloembergen-Purcell-Pound formula upon introducing distributions of the activation energies. The average correlation times of proton hopping were deduced from the Ti data. The conductivity which was calculated from the Einstein equation, by using nuclear magnetic resonance correlation times which assumed that the jump distance in proton-hopping was 0.1nm, yielded quantitative agreement with measured conductivities over a wide temperature range.

High Temperature H NMR Study of Proton Conducting Oxide Sr(Ce,Y)O3. H.Maekawa, N.Kashii, J.I.Kawamura, T.Yamamura: Solid State Ionics, 1999, 122[1-4], 231-6