Enhanced sintering of yttrium-doped barium zirconate by addition of ZnO

Peter Babilo, Sossina M. Haile*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

460 Scopus citations

Abstract

The influence of transition metal oxides additives, especially zinc oxide, on the densification and electrical properties of doped barium zirconate have been examined. With the use of zinc oxide as a sintering aid, BaZr 0.85Y 0.15O 3-δ was readily sintered to above 93% of theoretical density at 1300°C. Scanning electron microscopic investigations showed Zn accumulation in the intergranular regions. Thermogravimetric analysis of the material under flowing CO 2 showed ZnO-modifted barium zirconate to exhibit excellent chemical stability. The conductivity, as measured by A.C. impedance spectroscopy under H 2O saturated nitrogen, was slightly lower than that of unmodified barium zirconate. Electromotive force measurements under fuel cell conditions revealed the total ionic transport number to be ∼0.9 at 600°C. The combination of electrical and chemical properties and good sinterability render ZnO-modified barium zirconate an excellent candidate for reduced temperature solid oxide fuel cell applications.

Original languageEnglish (US)
Pages (from-to)2362-2368
Number of pages7
JournalJournal of the American Ceramic Society
Volume88
Issue number9
DOIs
StatePublished - Sep 1 2005

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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