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

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

Research output: Contribution to journalConference article

16 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)121-126
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume756
Publication statusPublished - 2003 Jul 25
EventSolid State Ionics 2002 - Boston MA, United States
Duration: 2002 Dec 22002 Dec 5

ASJC Scopus subject areas

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

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