Enhancement of grain-boundary conduction in gadolinia-doped ceria by the scavenging of highly resistive siliceous phase

Yoon Ho Cho, Pyeong Seok Cho, Graeme Auchterlonie, Doo Kang Kim, Jong Heun Lee, Doh Yeon Kim, Hyun Min Park, John Drennan

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

This paper proposes MgO as a new scavenger material that can mitigate the harmful effects of SiO2 impurity on the grain-boundary conduction in 10 mol.% gadolinia-doped ceria (GDC). The addition of 0.3-10 mol.% of MgO resulted in an up to ∼45-fold increase in the grain-boundary conduction of a GDC specimen containing 500 ppm of SiO2 impurity. The solubility limit of MgO in GDC was found to be as low as ∼0.1 mol.% and most of the MgO existed as a second phase. Electron energy-loss spectroscopic analysis indicated the formation of forsterite (Mg2SiO4), due to a reaction between MgO and the siliceous intergranular phase, to be the scavenging mechanism.

Original languageEnglish
Pages (from-to)4807-4815
Number of pages9
JournalActa Materialia
Volume55
Issue number14
DOIs
Publication statusPublished - 2007 Aug 1

Keywords

  • Electrical resistivity/conductivity
  • Electron energy loss spectroscopy (EELS)
  • Grain-boundary segregation
  • Scavenging reaction
  • Solid electrolytes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Metals and Alloys

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