Effect of isovalent cation substitution on conductivity and microstructure of sintered yttrium-doped barium zirconate

Susumu Imashuku, Tetsuya Uda, Yoshitaro Nose, Yasuhiro Awakura

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The effects of isovalent cation substitution in yttrium-doped barium zirconate on microstructure and bulk conductivity were examined. Substitution of titanium ion for zirconium ion and substitution of strontium ion for barium ion in yttrium-doped barium zirconate reduce the bulk conductivity and promote grain growth. These two substitutions are expected to increase the concentration of yttrium in A site (barium site). Well-grown grains are indirect evidence of the increase in the concentration of the dopant cation into A site because it has been reported that extra barium oxide promotes grain growth. The titanium substituted yttrium-doped barium zirconate showed the higher activation energy and lower pre-exponential term for proton jump than those of yttrium-doped barium zirconate. Strontium substituted yttrium-doped barium zirconate showed the higher activation energy but the higher pre-exponential terms.

Original languageEnglish
Pages (from-to)672-676
Number of pages5
JournalJournal of Alloys and Compounds
Volume490
Issue number1-2
DOIs
Publication statusPublished - 2010 Feb 4
Externally publishedYes

Keywords

  • Barium zirconate
  • Fuel cell
  • Ionic radius
  • Substitution of cation in barium zirconate

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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