Boysen, H.; Lerch, M.; Fernandez-Alonso, F.; Krzystyniak, M.; Lalowicz, Z.T.; Chatzidimitriou-Dreismann, C.A.; Tovar, M.: On the mechanism of proton conductivity in H3OSbTeO6. Journal of Physics and Chemistry of Solids 73 (2012), p. 808-817
10.1016/j.jpcs.2012.02.004
Abstract:
Pyrochlore-type H3OSbTeO6 is a remarkable proton conductor exhibiting an outstanding electrical conductivity even at ambient temperature. It consists of a three-dimensional interconnected (Sb,Te)O6 framework, built from randomly distributed corner-shared SbO6 and TeO6 octahedra, forming large cages in which the H3O+ ions are located. The dynamics of the caged species has been investigated by temperature-dependent neutron diffraction, quasielastic neutron scattering, and NMR experiments. Three types of motion may be discerned, namely, stochastic rotations of the H3O group around its 3-fold axis, jumps between four equivalent positions within the cage, and long-range inter-cage translational diffusion. The onset of ionic conductivity is clearly reflected by structural changes. Details of the complex diffusion mechanism are given.