Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-695-C8-698
Anelastic and Dielectric Relaxation Measurements in the Protonic Conductor Ba3(Ca1.18Nb1.82)O9-δS. Bausch, H.G. Bohn and W. Schilling
Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
In order to study the local proton motion in complex perovskite-type protonic conductors anelastic and dielectric relaxation measurements have been carried out at the compound Ba3(Ca1.18Nb1.82)O9-δ. Both techniques show spectra depending on the proton concentration. From the dielectric measurements an activation energy of Ea≈0.5 eV for the local reorientation of a proton-related defect can be derived. The observed anelastic spectra support the assumption that the same type of defect gives rise to an anelastic relaxation peak. Partial desorption experiments of proton charged samples reveal a rather complex defect behavior.
© EDP Sciences 1996