Electrical conduction in Sr-doped (La0.99Ce 0.01)PO4

Naoto Kitamura, Koji Amezawa, Yoichi Tomii, Teiichi Hanada, Naoichi Yamamoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Electrical conduction in 1 mol% Sr-doped (La0.99Ce 0.01)PO4 was investigated at 500-925 °C under H 2/H2O and H2O/O2 conditions. Conductivities of the material at the investigated temperatures were 10- 5.1-10- 3.6 S•cm- 1 under the wet reducing condition, and 10- 5.4-10- 3.7 S•cm- 1 under the wet oxidizing condition. H/D isotope effect on conductivity confirmed dominant protonic conduction under the both conditions. Defect structures in the material were discussed from partial pressure dependency of the conductivity. Consequently, it was suggested that Ce4+ at Ce 3+ sites mainly compensated acceptor charge under oxidizing conditions, although the material primarily conducted protons. On the other hand, under reducing condition, protons and oxygen deficits became dominant positive defects while reducing Ce4+ to Ce3+.

Original languageEnglish
Pages (from-to)2875-2879
Number of pages5
JournalSolid State Ionics
Volume176
Issue number39-40
DOIs
Publication statusPublished - 2005 Dec 1
Externally publishedYes

Keywords

  • Defect structure
  • Electronic conduction
  • High temperature protonic conduction
  • Rare earth orthophosphate

ASJC Scopus subject areas

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

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