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

doi:10.1016/j.actamat.2007.05.001

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 journal › Article › peer-review

78 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 language	English
Pages (from-to)	4807-4815
Number of pages	9
Journal	Acta Materialia
Volume	55
Issue number	14
DOIs	https://doi.org/10.1016/j.actamat.2007.05.001
Publication status	Published - 2007 Aug

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
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2007.05.001

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

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.",

keywords = "Electrical resistivity/conductivity, Electron energy loss spectroscopy (EELS), Grain-boundary segregation, Scavenging reaction, Solid electrolytes",

author = "Cho, {Yoon Ho} and Cho, {Pyeong Seok} and Graeme Auchterlonie and Kim, {Doo Kang} and Lee, {Jong Heun} and Kim, {Doh Yeon} and Park, {Hyun Min} and John Drennan",

note = "Funding Information: This work was supported by Korea Energy Management Corporation Grant (2005-N-PV03-P-02).",

year = "2007",

month = aug,

doi = "10.1016/j.actamat.2007.05.001",

language = "English",

volume = "55",

pages = "4807--4815",

journal = "Acta Materialia",

issn = "1359-6454",

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T1 - Enhancement of grain-boundary conduction in gadolinia-doped ceria by the scavenging of highly resistive siliceous phase

AU - Cho, Yoon Ho

AU - Cho, Pyeong Seok

AU - Auchterlonie, Graeme

AU - Kim, Doo Kang

AU - Lee, Jong Heun

AU - Kim, Doh Yeon

AU - Park, Hyun Min

AU - Drennan, John

N1 - Funding Information: This work was supported by Korea Energy Management Corporation Grant (2005-N-PV03-P-02).

PY - 2007/8

Y1 - 2007/8

N2 - 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.

AB - 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.

KW - Electrical resistivity/conductivity

KW - Electron energy loss spectroscopy (EELS)

KW - Grain-boundary segregation

KW - Scavenging reaction

KW - Solid electrolytes

UR - http://www.scopus.com/inward/record.url?scp=34447308741&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2007.05.001

DO - 10.1016/j.actamat.2007.05.001

M3 - Article

AN - SCOPUS:34447308741

SN - 1359-6454

VL - 55

SP - 4807

EP - 4815

JO - Acta Materialia

JF - Acta Materialia

IS - 14

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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