Proton Diffusion in Strontium Cerate Ceramics studied by Quasielastic Neutron Scattering and Impedance Spectroscopy

Ch Karmonik; R. Hempelmann; Th Matzke; T. Springer

doi:10.1515/zna-1995-0605

Proton Diffusion in Strontium Cerate Ceramics studied by Quasielastic Neutron Scattering and Impedance Spectroscopy

Ch Karmonik, R. Hempelmann, Th Matzke, T. Springer

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Abstract

Perovskite structured strontium cerate doped with ytterbium and water, e.g. SrCe_O. ₉₅Yb_0.05 H_0.02O_2.985, 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.

Original language	English (US)
Pages (from-to)	539-548
Number of pages	10
Journal	Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume	50
Issue number	6
DOIs	https://doi.org/10.1515/zna-1995-0605
State	Published - Jun 1 1995

ASJC Scopus subject areas

Mathematical Physics
General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Proton Diffusion in Strontium Cerate Ceramics studied by Quasielastic Neutron Scattering and Impedance Spectroscopy",

abstract = "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.",

author = "Ch Karmonik and R. Hempelmann and Th Matzke and T. Springer",

note = "Funding Information: We thank U. Stimming (KFA J{\"u}lich) 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.",

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doi = "10.1515/zna-1995-0605",

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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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Proton Diffusion in Strontium Cerate Ceramics studied by Quasielastic Neutron Scattering and Impedance Spectroscopy

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