Preparation and oxygen permeability of Gd-doped ceria and spinel-type ferrite composites

Hitoshi Takamura; Masashi Kawai; Katsutoshi Okumura; Atsunori Kamegawa; Masuo Okada

Preparation and oxygen permeability of Gd-doped ceria and spinel-type ferrite composites

Hitoshi Takamura, Masashi Kawai, Katsutoshi Okumura, Atsunori Kamegawa, Masuo Okada

ENG - Materials Science

Research output: Contribution to journal › Conference article › peer-review

17 Citations (Scopus)

Abstract

The preparation and oxygen permeability of composites of Ce_0.8Gd_0.2O_2-δ (GDC) and spinel-type ferrites, MFe₂O₄ (M = Co and Mn) have been investigated. The composites of GDC-x vol% MFe₂O₄, where x ranged from 5 to 65, were prepared by a citrate-based liquid-mix technique. The composites were found to be almost fully densified by sintering at 1300°C for 2 h. From TEM observations, the grain size of GDC and spinel-type phases was found to be less than 0.5 μm. In the case of M = Co, GDC - 25 vol% CoFe₂O₄ with a membrane thickness of 1.0 mm exhibited an oxygen flux density of 0.21 μmol·cm^-2·s^-1 under the P(O₂) difference between He (20 sccm) and air at 1000°C. Under reducing atmosphere of Ar-5%H₂, the oxygen flux density of this composite increased up to 1.3 μmol·cm^-2·s^-1. Moreover, under Ar-10%CH₄ gas flow, GDC - 15 vol% MnFe₂O₄ with a membrane thickness of 0.24 mm exhibited the oxygen flux density of 2 and 7 μmol·cm^-2·s^-1 at 800 and 1000°C, respectively.

Original language	English
Pages (from-to)	121-126
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	756
Publication status	Published - 2003 Jul 25
Event	Solid State Ionics 2002 - Boston MA, United States Duration: 2002 Dec 2 → 2002 Dec 5

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Preparation and oxygen permeability of Gd-doped ceria and spinel-type ferrite composites",

abstract = "The preparation and oxygen permeability of composites of Ce0.8Gd0.2O2-δ (GDC) and spinel-type ferrites, MFe2O4 (M = Co and Mn) have been investigated. The composites of GDC-x vol% MFe2O4, where x ranged from 5 to 65, were prepared by a citrate-based liquid-mix technique. The composites were found to be almost fully densified by sintering at 1300°C for 2 h. From TEM observations, the grain size of GDC and spinel-type phases was found to be less than 0.5 μm. In the case of M = Co, GDC - 25 vol% CoFe2O4 with a membrane thickness of 1.0 mm exhibited an oxygen flux density of 0.21 μmol·cm-2·s-1 under the P(O2) difference between He (20 sccm) and air at 1000°C. Under reducing atmosphere of Ar-5%H2, the oxygen flux density of this composite increased up to 1.3 μmol·cm-2·s-1. Moreover, under Ar-10%CH4 gas flow, GDC - 15 vol% MnFe2O4 with a membrane thickness of 0.24 mm exhibited the oxygen flux density of 2 and 7 μmol·cm-2·s-1 at 800 and 1000°C, respectively.",

author = "Hitoshi Takamura and Masashi Kawai and Katsutoshi Okumura and Atsunori Kamegawa and Masuo Okada",

year = "2003",

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volume = "756",

pages = "121--126",

journal = "Materials Research Society Symposium - Proceedings",

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TY - JOUR

T1 - Preparation and oxygen permeability of Gd-doped ceria and spinel-type ferrite composites

AU - Takamura, Hitoshi

AU - Kawai, Masashi

AU - Okumura, Katsutoshi

AU - Kamegawa, Atsunori

AU - Okada, Masuo

PY - 2003/7/25

Y1 - 2003/7/25

N2 - The preparation and oxygen permeability of composites of Ce0.8Gd0.2O2-δ (GDC) and spinel-type ferrites, MFe2O4 (M = Co and Mn) have been investigated. The composites of GDC-x vol% MFe2O4, where x ranged from 5 to 65, were prepared by a citrate-based liquid-mix technique. The composites were found to be almost fully densified by sintering at 1300°C for 2 h. From TEM observations, the grain size of GDC and spinel-type phases was found to be less than 0.5 μm. In the case of M = Co, GDC - 25 vol% CoFe2O4 with a membrane thickness of 1.0 mm exhibited an oxygen flux density of 0.21 μmol·cm-2·s-1 under the P(O2) difference between He (20 sccm) and air at 1000°C. Under reducing atmosphere of Ar-5%H2, the oxygen flux density of this composite increased up to 1.3 μmol·cm-2·s-1. Moreover, under Ar-10%CH4 gas flow, GDC - 15 vol% MnFe2O4 with a membrane thickness of 0.24 mm exhibited the oxygen flux density of 2 and 7 μmol·cm-2·s-1 at 800 and 1000°C, respectively.

AB - The preparation and oxygen permeability of composites of Ce0.8Gd0.2O2-δ (GDC) and spinel-type ferrites, MFe2O4 (M = Co and Mn) have been investigated. The composites of GDC-x vol% MFe2O4, where x ranged from 5 to 65, were prepared by a citrate-based liquid-mix technique. The composites were found to be almost fully densified by sintering at 1300°C for 2 h. From TEM observations, the grain size of GDC and spinel-type phases was found to be less than 0.5 μm. In the case of M = Co, GDC - 25 vol% CoFe2O4 with a membrane thickness of 1.0 mm exhibited an oxygen flux density of 0.21 μmol·cm-2·s-1 under the P(O2) difference between He (20 sccm) and air at 1000°C. Under reducing atmosphere of Ar-5%H2, the oxygen flux density of this composite increased up to 1.3 μmol·cm-2·s-1. Moreover, under Ar-10%CH4 gas flow, GDC - 15 vol% MnFe2O4 with a membrane thickness of 0.24 mm exhibited the oxygen flux density of 2 and 7 μmol·cm-2·s-1 at 800 and 1000°C, respectively.

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M3 - Conference article

AN - SCOPUS:0038825638

VL - 756

SP - 121

EP - 126

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

SN - 0272-9172

T2 - Solid State Ionics 2002

Y2 - 2 December 2002 through 5 December 2002

ER -

Preparation and oxygen permeability of Gd-doped ceria and spinel-type ferrite composites

Abstract

ASJC Scopus subject areas

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