Structural, thermal and electrical properties of Bi and Y co-doped barium zirconium cerates

Christophe T G Petit, Shanwen Tao

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4 Citations (Scopus)

Abstract

Bismuth- and yttrium-co-doped barium cerates were successfully synthesised by solid-state reactions followed by sintering between 1,400 and 1,500 °C for 1 to 6 h allowing densification above 98 % to be obtained. All samples were found to retain their original orthorhombic structure after treatment in either oxidising or reducing atmospheres (dry and wet). Mechanical strength was affected by structure upon reduction due in part to strains and stresses induced by bismuth ionic size variations. Conductivity values as high as 0.055 S/cm were obtained for sample BaCe0.6Zr0.1Y0.1Bi0.2O3-δ and of 0.0094 S/cm for the Zr-free compound BaCe0.7Y0.2Bi0.1O3-δ at 700 °C in air. In all the investigated materials, sample BaCe0.6Zr0.1Y0.1Bi0.2O3-δ exhibits the highest conductivity in both air and wet 5 % H2/Ar with good mechanical strength. BaCe0.6Zr0.1Y0.1Bi0.2O3-δ is a promising mixed H+/e- conductor, a potential component of composite anode for solid oxide fuel cells.

Original languageEnglish
Pages (from-to)363-371
Number of pages9
JournalIonics
Volume20
Issue number3
Early online date8 Sep 2013
DOIs
Publication statusPublished - 1 Mar 2014

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Keywords

  • barium cerate
  • co-doping
  • conductivity
  • proton
  • stability

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