Electrical conductivity of Al-doped La1-xSrxScO3 perovskite-type oxides as electrolyte materials for low-temperature SOFC

Hisashi Kato, Takashi Kudo, Hitoshi Naito, Hiroo Yugami

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

As an electrolyte material for reduced temperature solid oxide fuel cell (SOFC), La1 - xSrxScO3 - α (x = 0.05-0.5) solid oxides with high ionic conductivity were synthesized by the solid phase method. The electrical conductivity rose as the value of x increased. For x ≥ 0.35, the compound underwent a phase transition at 1073 K. Adding 2 mol% Al to the Sc site was very effective in suppressing this transition. However, the electrical conductivity of La0.65Sr0.35Sc0.98Al0.02O3 was lower than that of La0.675Sr0.325ScO3. La0.675Sr0.325ScO3, an unstable solid, maintained high ionic conductivity even when effectively stabilized by 1 mol% Al doping at the Sc site. Furthermore, no n-type conduction of La0.675Sr0.325Sc0.99Al0.01O3 was observed under low oxygen partial pressure.

Original languageEnglish
Pages (from-to)217-222
Number of pages6
JournalSolid State Ionics
Volume159
Issue number3-4
DOIs
Publication statusPublished - 2003 Apr

Keywords

  • Doping
  • Electrical conductivity
  • Perovskite
  • Phase transition
  • Scandium oxide

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Electrical conductivity of Al-doped La<sub>1-x</sub>Sr<sub>x</sub>ScO<sub>3</sub> perovskite-type oxides as electrolyte materials for low-temperature SOFC'. Together they form a unique fingerprint.

Cite this