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

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

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)539-548
Number of pages10
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume50
Issue number6
DOIs
StatePublished - Jun 1 1995

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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