The relationship between chemical composition distributions and specific grain boundary conductivity in Y-doped BaZrO3 proton conductors

Fumitada Iguchi, Takao Tsurui, Noriko Sata, Yuki Nagao, Hiroo Yugami

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

The relationship between chemical composition at a grain boundary and specific grain boundary conductivity is studied in Y-doped BaZrO3 ceramics sintered at 1800 °C. Y enrichment at the grain boundary as yttrium concentration increased and Ba deficiency in ceramics as an increase of sintering time are observed. At the grain boundary, phase segregation, i.e. existence of secondary phase and amorphous phase which prevent proton migration, is not observed. The results indicate that at the grain boundary, concentration of Ba vacancy and Y substituted into Zr site is changed. Grain boundary conductivity shows significant dependences to Ba deficiency and Y concentration in ceramics. It is due to significant dependences of specific grain boundary conductivity to Ba deficiency and Y concentration in ceramics. The results indicate that proton migration across the grain boundary is sensitive to concentration of those effectively charged defect, i.e. Y substituted into Zr site and Ba vacancy at grain boundary.

Original languageEnglish
Pages (from-to)563-568
Number of pages6
JournalSolid State Ionics
Volume180
Issue number6-8
DOIs
Publication statusPublished - 2009 May 14

Keywords

  • BaZrO
  • Grain boundary
  • Intermediate temperature operating SOFC
  • Proton conductors
  • STEM

ASJC Scopus subject areas

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

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