Ionic conduction and nonstoichiometry in non-doped BaxCeO3-α

Guilin Ma, Hiroshige Matsumoto, Hiroyasu Iwahara

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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 languageEnglish
Pages (from-to)237-247
Number of pages11
JournalSolid State Ionics
Volume122
Issue number1-4
DOIs
Publication statusPublished - Jul 1 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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