Processing of yttrium-doped barium zirconate for high proton conductivity

Peter Babilo, Tetsuya Uda, Sossina M. Haile*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

294 Scopus citations

Abstract

The factors governing the transport properties of yttrium-doped barium zirconate (BYZ) have been explored, with the aim of attaining reproducible proton conductivity in well-densified samples. It was found that a small initial particle size (50-100 nm) and high-temperature sintering (1600 °C) in the presence of excess barium were essential. By this procedure, BaZr0.8Y0.2O3-8 with 93% to 99% theoretical density and total (bulk plus grain boundary) conductivity of 7.9 × 10-3 S/cm at 600 °C [as measured by alternating current (ac) impedance spectroscopy under humidified nitrogen] could be reliably prepared. Samples sintered in the absence of excess barium displayed yttria-like precipitates and a bulk conductivity that was reduced by more than 2 orders of magnitude.

Original languageEnglish (US)
Pages (from-to)1322-1330
Number of pages9
JournalJournal of Materials Research
Volume22
Issue number5
DOIs
StatePublished - May 2007

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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