Abstract
Ionic conduction and Ba2+:Ce4+ site nonstoichiometry in perovskite-type oxide sinters of non-doped BaxCeO3-α (0.90 ≤ x ≤ 1.10) have been investigated. X-ray powder diffraction patterns of these sinters indicated that the specimens with 0.95 ≤ x ≤ 1.10 were a single phase of orthorhombic perovskite-type BaCeO3, while the sinter with x = 0.90 was a mixed phase of perovskite and CeO2 impurity. The conduction properties of the specimens with 0.95 ≤ x ≤ 1.05 were studied electrochemically in the temperature range of 600-1000. The conduction properties of the specimens were strongly influenced by Ba2+:Ce4+ site nonstoichiometry. The specimens with excess Ba showed a predominant ionic conduction (H+ + O2-) with ion transport number larger than 0.5 under hydrogen atmosphere, whereas they showed a poor oxide-ionic conduction (oxide-ion transport numbers < 0.1) under oxidizing atmosphere. Protonic conduction in these specimens under reducing atmosphere could be confirmed by means of electrochemical hydrogen permeation. In contrast, the specimens with x ≤ 1.00 showed a predominant oxygen-ionic conduction (oxygen-ion transport numbers > 0.8) in oxidative atmosphere, while a poor ionic conduction (ion transport numbers < 0.1) was observed in hydrogen.
Original language | English |
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Pages (from-to) | 237-247 |
Number of pages | 11 |
Journal | Solid State Ionics |
Volume | 122 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - Jul 1 1999 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics