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 language | English |
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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