Dielectric relaxation of protonic defects in hydrated and dehydrated SrZrO3:Yb

O. Kamishima, Y. Abe, T. Ishii, J. Kawamura, T. Hattori

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12 Citations (Scopus)

Abstract

Dielectric relaxations of proton conductor Yb-doped SrZrO3 have been measured as a function of temperature and frequency in different pretreatments with water vapor. Well defined two relaxation peaks were observed in the compounds doped with more than 1 mol% of Yb irrespective of annealing in WET (hydrate) or DRY (dehydrate) conditions. These two relaxations can be assigned to reorientations of Yb-proton dipole at an isolated [YbO6]-octahedron and at a [YbO6]-[YbO6]-... cluster in the SrZrO3 crystal (i.e. effectively negative charged Yb and positive charged proton). By DRY pretreatment, the magnitude of the dipole strength was almost fixed for the isolated Yb-proton dipole, while the magnitude became significantly decreased for the dipole associated with the Yb-cluster. It shows the proton associated with the isolated Yb is more stable than that with the Yb-cluster.

Original languageEnglish
Pages (from-to)2375-2379
Number of pages5
JournalSolid State Ionics
Volume177
Issue number26-32 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct 31

Keywords

  • Complex dielectric constant
  • Dielectric relaxation
  • Infrared absorption
  • Perovskite oxide
  • Proton conductor
  • SrZrO

ASJC Scopus subject areas

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

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