Improvement of grain-boundary conduction in gadolinia-doped ceria by the addition of CaO

Pyeong Seok Cho; Sung Bo Lee; Dong Suk Kim; Jong Heun Lee; Doh Yeon Kim; Hyun Min Park

doi:10.1149/1.2214235

Improvement of grain-boundary conduction in gadolinia-doped ceria by the addition of CaO

Pyeong Seok Cho, Sung Bo Lee, Dong Suk Kim, Jong Heun Lee, Doh Yeon Kim, Hyun Min Park

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

37 Citations (Scopus)

Abstract

This study examined the effect of CaO addition on grain-boundary conductivity in 10 mol % Gd₂O₃-doped CeO₂containing 500 ppm SiO₂as an impurity. The addition of CaO increased the grain-boundary conductivity ∼50 times without affecting the grain-interior conductivity significantly. CaO was incorporated into the CeO₂lattice completely, which means that a scavenging reaction between a large CaO-related second phase and siliceous impurity was not the reason for the increased conductivity. After adding CaO, grain boundary structure changed from random to faceted. Configuration change in the grain-boundary segregation in relation to the boundary-structure variation is suggested as a possible reason.

Original language	English
Pages (from-to)	A399-A402
Journal	Electrochemical and Solid-State Letters
Volume	9
Issue number	9
DOIs	https://doi.org/10.1149/1.2214235
Publication status	Published - 2006 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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title = "Improvement of grain-boundary conduction in gadolinia-doped ceria by the addition of CaO",

abstract = "This study examined the effect of CaO addition on grain-boundary conductivity in 10 mol % Gd2O3-doped CeO2containing 500 ppm SiO2as an impurity. The addition of CaO increased the grain-boundary conductivity ∼50 times without affecting the grain-interior conductivity significantly. CaO was incorporated into the CeO2lattice completely, which means that a scavenging reaction between a large CaO-related second phase and siliceous impurity was not the reason for the increased conductivity. After adding CaO, grain boundary structure changed from random to faceted. Configuration change in the grain-boundary segregation in relation to the boundary-structure variation is suggested as a possible reason.",

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AU - Cho, Pyeong Seok

AU - Lee, Sung Bo

AU - Kim, Dong Suk

AU - Lee, Jong Heun

AU - Kim, Doh Yeon

AU - Park, Hyun Min

PY - 2006/1/1

Y1 - 2006/1/1

N2 - This study examined the effect of CaO addition on grain-boundary conductivity in 10 mol % Gd2O3-doped CeO2containing 500 ppm SiO2as an impurity. The addition of CaO increased the grain-boundary conductivity ∼50 times without affecting the grain-interior conductivity significantly. CaO was incorporated into the CeO2lattice completely, which means that a scavenging reaction between a large CaO-related second phase and siliceous impurity was not the reason for the increased conductivity. After adding CaO, grain boundary structure changed from random to faceted. Configuration change in the grain-boundary segregation in relation to the boundary-structure variation is suggested as a possible reason.

AB - This study examined the effect of CaO addition on grain-boundary conductivity in 10 mol % Gd2O3-doped CeO2containing 500 ppm SiO2as an impurity. The addition of CaO increased the grain-boundary conductivity ∼50 times without affecting the grain-interior conductivity significantly. CaO was incorporated into the CeO2lattice completely, which means that a scavenging reaction between a large CaO-related second phase and siliceous impurity was not the reason for the increased conductivity. After adding CaO, grain boundary structure changed from random to faceted. Configuration change in the grain-boundary segregation in relation to the boundary-structure variation is suggested as a possible reason.

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Improvement of grain-boundary conduction in gadolinia-doped ceria by the addition of CaO

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