Mixed dopant effect in SrZrO3-based proton conductor

Takahisa Omata, Tomonao Fuke, Shinya Otsuka-Yao-Matsuo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The infrared diffuse reflectance spectra in the O-H stretching vibration, νOH, region and the electrical conductivities of Sr(Zr0.92Y0.08 - xScx)O3 - δ and Sr(Zr0.92Y0.08 - xGax)O3 - δ were studied. Whereas the dissolution environment of the proton and the dopant in the terminal compounds was maintained in the Sr(Zr0.92Y0.08 - xScx)O3 - δ, distinctly different proton sites from those in the terminal Sr(Zr0.92Y0.08)O3 - δ and Sr(Zr0.92Ga0.08)O3 - δ appeared in the Sr(Zr0.92Y0.08 - xGax)O3 - δ. The electrical conductivity of the Sr(Zr0.92Y0.08 - xScx)O3 - δ showed a very small increase upon substitution of Y by Sc. The small increase in conductivity for the Sc-doped case was discussed from the viewpoint of proton mobility. For the Sr(Zr0.92Y0.08 - xGax)O3 - δ, the conductivity decreased over an order of magnitude by the substitution of Y by Ga. This decrease in conductivity for the Ga-doped case was attributed to the decrease in the proton concentration.

Original languageEnglish
Pages (from-to)1116-1119
Number of pages4
JournalSolid State Ionics
Volume179
Issue number21-26
DOIs
Publication statusPublished - 2008 Sep 15
Externally publishedYes

Keywords

  • Dopant segregation
  • Infrared spectroscopy
  • Proton conductor
  • Proton dissolution environment

ASJC Scopus subject areas

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

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