Electric conductivity and oxygen permeability of modified cerium oxides

Xiwang Qi; Y. S. Lin; C. T. Holt; S. L. Swartz

doi:10.1023/A:1022310200205

Electric conductivity and oxygen permeability of modified cerium oxides

Xiwang Qi, Y. S. Lin, C. T. Holt, S. L. Swartz

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

43 Scopus citations

Abstract

Electrical conductivities of samarium (Sm), terbium (Tb), praseodymium (Pr) and zirconium (Zr) doped ceria membranes were measured in T = 600-900°C and pO₂ = 10^-22-0.21 atm. Doping Sm and Pr in CeO₂ respectively enhances the ionic conductivity and electron-hole conductivity of ceria. Sm-Pr doped ceria exhibits both n-type (at lower pO₂) and p-type (at high pO₂) electronic and ionic conductivity in the temperature range studied. Adding Tb in the Sm doped ceria causes a reduction in ionic conductivity. Zr-Pr doped ceria is an n-type electronic conductor at low Po₂ and p-type electronic conductor at high pO₂. The ionic conductivity of Zr-Pr doped ceria is lower than Sm doped ceria but higher than pure ceria. Oxygen permeation flux through the Zr-Pr doped ceria membrane, dominated by the slow oxygen ionic conduction, is similar to the ytttria doped bismuth oxide membrane, and smaller, but close to that of perovskite-type lanthanum cobaltite membrane.

Original language	English (US)
Pages (from-to)	1073-1079
Number of pages	7
Journal	Journal of Materials Science
Volume	38
Issue number	5
DOIs	https://doi.org/10.1023/A:1022310200205
State	Published - Mar 1 2003
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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title = "Electric conductivity and oxygen permeability of modified cerium oxides",

abstract = "Electrical conductivities of samarium (Sm), terbium (Tb), praseodymium (Pr) and zirconium (Zr) doped ceria membranes were measured in T = 600-900°C and pO2 = 10-22-0.21 atm. Doping Sm and Pr in CeO2 respectively enhances the ionic conductivity and electron-hole conductivity of ceria. Sm-Pr doped ceria exhibits both n-type (at lower pO2) and p-type (at high pO2) electronic and ionic conductivity in the temperature range studied. Adding Tb in the Sm doped ceria causes a reduction in ionic conductivity. Zr-Pr doped ceria is an n-type electronic conductor at low Po2 and p-type electronic conductor at high pO2. The ionic conductivity of Zr-Pr doped ceria is lower than Sm doped ceria but higher than pure ceria. Oxygen permeation flux through the Zr-Pr doped ceria membrane, dominated by the slow oxygen ionic conduction, is similar to the ytttria doped bismuth oxide membrane, and smaller, but close to that of perovskite-type lanthanum cobaltite membrane.",

author = "Xiwang Qi and Lin, {Y. S.} and Holt, {C. T.} and Swartz, {S. L.}",

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T1 - Electric conductivity and oxygen permeability of modified cerium oxides

AU - Qi, Xiwang

AU - Lin, Y. S.

AU - Holt, C. T.

AU - Swartz, S. L.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - Electrical conductivities of samarium (Sm), terbium (Tb), praseodymium (Pr) and zirconium (Zr) doped ceria membranes were measured in T = 600-900°C and pO2 = 10-22-0.21 atm. Doping Sm and Pr in CeO2 respectively enhances the ionic conductivity and electron-hole conductivity of ceria. Sm-Pr doped ceria exhibits both n-type (at lower pO2) and p-type (at high pO2) electronic and ionic conductivity in the temperature range studied. Adding Tb in the Sm doped ceria causes a reduction in ionic conductivity. Zr-Pr doped ceria is an n-type electronic conductor at low Po2 and p-type electronic conductor at high pO2. The ionic conductivity of Zr-Pr doped ceria is lower than Sm doped ceria but higher than pure ceria. Oxygen permeation flux through the Zr-Pr doped ceria membrane, dominated by the slow oxygen ionic conduction, is similar to the ytttria doped bismuth oxide membrane, and smaller, but close to that of perovskite-type lanthanum cobaltite membrane.

AB - Electrical conductivities of samarium (Sm), terbium (Tb), praseodymium (Pr) and zirconium (Zr) doped ceria membranes were measured in T = 600-900°C and pO2 = 10-22-0.21 atm. Doping Sm and Pr in CeO2 respectively enhances the ionic conductivity and electron-hole conductivity of ceria. Sm-Pr doped ceria exhibits both n-type (at lower pO2) and p-type (at high pO2) electronic and ionic conductivity in the temperature range studied. Adding Tb in the Sm doped ceria causes a reduction in ionic conductivity. Zr-Pr doped ceria is an n-type electronic conductor at low Po2 and p-type electronic conductor at high pO2. The ionic conductivity of Zr-Pr doped ceria is lower than Sm doped ceria but higher than pure ceria. Oxygen permeation flux through the Zr-Pr doped ceria membrane, dominated by the slow oxygen ionic conduction, is similar to the ytttria doped bismuth oxide membrane, and smaller, but close to that of perovskite-type lanthanum cobaltite membrane.

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Electric conductivity and oxygen permeability of modified cerium oxides

Abstract

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