Quasielastic thermal neutron scattering experiment on the proton conductor SrCe0.95Yb0.05H0.02O2.985

Th Matzke, U. Stimming, Christof Karmonik, M. Soetratmo, R. Hempelmann, F. Güthoff

Research output: Contribution to journalArticle

104 Scopus citations

Abstract

On the basis of a QENS experiment using thermal neutrons on the proton conductor SrCe0.95Yb0.05H0.02O2.985 we extend our two-state model for the proton diffusion in this compound. This model was developed from a recent high resolution QENS experiment using cold neutrons, with the first state representing free diffusion of the protons (jumping from oxygen to oxygen forming OH ; free state) and the second state representing protons trapped on energetically lowered sites (nearby an Yb3+ ion on a Ce4+ site; trapped state); into this model we integrate a very fast localized motion taking place in the free state as a reorientation of the OH.. ions. This motion is visible as a broad quasielastic component in the neutron energy spectra and exhibits a very low activation energy.

Original languageEnglish (US)
Pages (from-to)621-628
Number of pages8
JournalSolid State Ionics
Volume86-88
Issue numberPART 1
DOIs
StatePublished - Jan 1 1996

Keywords

  • Proton conductor
  • Quasielastic neutron scattering
  • Thermal neutrons

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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