Mitigation of highly resistive grain-boundary phase in gadolinia-doped ceria by the addition of SrO

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

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The effect of SrO in improving the grain-boundary conduction in gadolinia-doped ceria (GDC) was examined by measuring the spatially resolved local impedance of a SrO-in-diffused GDC specimen containing 500 ppm of Si O2. The addition of SrO increased the grain-boundary conduction by up to ∼120 times, indicating that SrO effectively mitigates the highly resistive intergranular phase. This paper discusses the possible reasons in terms of the grain-boundary structure, the incorporation of SrO into the GDC lattice, the formation of a second phase, and a scavenging reaction.

Original languageEnglish
Pages (from-to)91-95
Number of pages5
JournalElectrochemical and Solid-State Letters
Volume10
Issue number5
DOIs
Publication statusPublished - 2007 Jan 1

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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