Site selectivity of dopants in BaZr 1-yM yO 3-δ (M = Sc, Y, Sm, Eu, Dy) and measurement of their water contents and conductivities

Donglin Han, Yoshitaro Nose, Kozo Shinoda, Tetsuya Uda

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54 Citations (Scopus)

Abstract

The site selectivity of Sc, Y, Sm, Eu, and Dy in doped BaZrO 3 was investigated. The measurement of water contents and conductivities of the samples were performed. The results revealed that for doping rare-earth cations into BaZrO 3, all the examined dopants mainly occupied B-site, while a partial A-site occupation of Sm and Eu was significantly recognized. Sm and Eu are considered to be more amphoteric for doping into BaZrO 3. The concentration of hydroxide ions in the sample of BaZr 0.8Dy 0.2O 3-δ hydrated in wet Ar was obviously higher than that hydrated in wet O 2 at the same humidification level. The bulk conductivity of BaZr 0.8Dy 0.2O 3-δ in wet Ar or H 2 is higher than that in a dry one, indicating the generation of protonic conductivity of BaZr 0.8Dy 0.2O 3-δ. The strong dependence of conductivity on partial pressure of oxygen was also recognized. The bulk conductivities of BaZr 0.8Dy 0.2O 3-δ in wet Ar and H 2 were comparable to that of BaZr 0.8Y 0.2O 3-δ.

Original languageEnglish
Pages (from-to)2-7
Number of pages6
JournalSolid State Ionics
Volume213
DOIs
Publication statusPublished - 2012 Apr 16

Keywords

  • BaZrO
  • Fuel cell
  • Hydration
  • Proton conductor
  • Site occupancy

ASJC Scopus subject areas

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

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