Improvement of grain-boundary conduction in SiO2-doped GDC by BaO addition

Seung Young Park; Pyeong Seok Cho; Sung Bo Lee; Hyun Min Park; Jong Heun Lee

doi:10.1149/1.3139074

Improvement of grain-boundary conduction in SiO₂-doped GDC by BaO addition

Seung Young Park, Pyeong Seok Cho, Sung Bo Lee, Hyun Min Park, Jong Heun Lee

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Barium oxide (BaO) was suggested as a scavenger material to mitigate the harmful siliceous intergranular phase in gadolinia-doped ceria (GDC). The addition of 1-5 mol % BaO to GDC specimens containing 500 ppm SiO₂ enhanced the grain-boundary conduction by ∼250 times. Transmission electron microscopy and electron probe microanalysis attributed this enhancement to the scavenging of the siliceous phase by the Ba-rich phase. In contrast, the grain-boundary conduction was significantly deteriorated when doped with 0.1-0.2 mol % BaO, which was attributed to the dissolution of BaO into the intergranular phase and the consequent increase in the ion-blocking effect at the grain boundary.

Original language	English
Pages (from-to)	B891-B896
Journal	Journal of the Electrochemical Society
Volume	156
Issue number	8
DOIs	https://doi.org/10.1149/1.3139074
Publication status	Published - 2009

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1149/1.3139074

Cite this

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title = "Improvement of grain-boundary conduction in SiO2-doped GDC by BaO addition",

abstract = "Barium oxide (BaO) was suggested as a scavenger material to mitigate the harmful siliceous intergranular phase in gadolinia-doped ceria (GDC). The addition of 1-5 mol % BaO to GDC specimens containing 500 ppm SiO2 enhanced the grain-boundary conduction by ∼250 times. Transmission electron microscopy and electron probe microanalysis attributed this enhancement to the scavenging of the siliceous phase by the Ba-rich phase. In contrast, the grain-boundary conduction was significantly deteriorated when doped with 0.1-0.2 mol % BaO, which was attributed to the dissolution of BaO into the intergranular phase and the consequent increase in the ion-blocking effect at the grain boundary.",

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T1 - Improvement of grain-boundary conduction in SiO2-doped GDC by BaO addition

AU - Park, Seung Young

AU - Cho, Pyeong Seok

AU - Lee, Sung Bo

AU - Park, Hyun Min

AU - Lee, Jong Heun

PY - 2009

Y1 - 2009

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AB - Barium oxide (BaO) was suggested as a scavenger material to mitigate the harmful siliceous intergranular phase in gadolinia-doped ceria (GDC). The addition of 1-5 mol % BaO to GDC specimens containing 500 ppm SiO2 enhanced the grain-boundary conduction by ∼250 times. Transmission electron microscopy and electron probe microanalysis attributed this enhancement to the scavenging of the siliceous phase by the Ba-rich phase. In contrast, the grain-boundary conduction was significantly deteriorated when doped with 0.1-0.2 mol % BaO, which was attributed to the dissolution of BaO into the intergranular phase and the consequent increase in the ion-blocking effect at the grain boundary.

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