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

doi:10.1149/1.2710959

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 journal › Article › peer-review

27 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 language	English
Pages (from-to)	91-95
Number of pages	5
Journal	Electrochemical and Solid-State Letters
Volume	10
Issue number	5
DOIs	https://doi.org/10.1149/1.2710959
Publication status	Published - 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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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.",

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AU - Cho, Pyeong Seok

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AU - Kim, Doh Yeon

AU - Park, Hyun Min

AU - Auchterlonie, Graeme

AU - Drennan, John

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

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