TY - JOUR
T1 - Proton Diffusion in Strontium Cerate Ceramics studied by Quasielastic Neutron Scattering and Impedance Spectroscopy
AU - Karmonik, Ch
AU - Hempelmann, R.
AU - Matzke, Th
AU - Springer, T.
N1 - Funding Information:
We thank U. Stimming (KFA Jülich) for valuable discussions and M. A. Adams (RAL) for his help during the experiment; financial support of R. H. by the Fonds der Chemischen Industrie is gratefully acknowledged.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1995/6/1
Y1 - 1995/6/1
N2 - Perovskite structured strontium cerate doped with ytterbium and water, e.g. SrCeO. 95Yb0.05 H0.02O2.985, is a well known proton conductor at elevated temperatures. We have studied its proton conductivity or diffusivity, respectively, by impedance spectroscopy, IS, and by quasielastic neutron scattering, QENS. While the former method yields a macroscopic proton diffusion coefficient, the latter method allows to elucidate the microscopic proton diffusion mechanism. It consists of a sequence of free diffusion and trapping/escape events with the Yb3+ ions acting as trapping centers. The self-diffusion coefficient obtained with QENS agrees with the conductivity diffusion coefficient obtained with IS.
AB - Perovskite structured strontium cerate doped with ytterbium and water, e.g. SrCeO. 95Yb0.05 H0.02O2.985, is a well known proton conductor at elevated temperatures. We have studied its proton conductivity or diffusivity, respectively, by impedance spectroscopy, IS, and by quasielastic neutron scattering, QENS. While the former method yields a macroscopic proton diffusion coefficient, the latter method allows to elucidate the microscopic proton diffusion mechanism. It consists of a sequence of free diffusion and trapping/escape events with the Yb3+ ions acting as trapping centers. The self-diffusion coefficient obtained with QENS agrees with the conductivity diffusion coefficient obtained with IS.
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U2 - 10.1515/zna-1995-0605
DO - 10.1515/zna-1995-0605
M3 - Article
AN - SCOPUS:21844494301
VL - 50
SP - 539
EP - 548
JO - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
JF - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
SN - 0932-0784
IS - 6
ER -