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

    34 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

    • General Chemical Engineering
    • General Materials Science
    • Physical and Theoretical Chemistry
    • Electrochemistry
    • Electrical and Electronic Engineering

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