Conductivity of SrTiO3 based oxides in the reducing atmosphere at high temperature

S. Hashimoto, F. W. Poulsen, M. Mogensen

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The conductivities of several donor-doped SrTiO3 based oxides, which were prepared in air, were studied in a reducing atmosphere at high temperature. The conductivities of all specimens increased slowly with time at 1000 °C in 9% H2/N2, even after 100 h. Nb-doped SrTiO3 showed relatively fast reduction and high conductivity compared with the other SrTiO3 based oxides. The conductivity of Nb-doped SrTiO3 was ca. 50 S cm-1 at 500 °C after reduction at 1200 °C. After strong reduction, the conductivity of Nb-doped SrTiO3 was almost independent of the oxygen partial pressure at 500-800 °C, while that of La-doped SrTiO3 dropped immediately on exposure to air. The conduction behavior of Nb-doped SrTiO3 was explained by reduction of Ti4+ and/or Nb5+ and the relatively slow oxygen diffusibility.

Original languageEnglish
Pages (from-to)232-236
Number of pages5
JournalJournal of Alloys and Compounds
Volume439
Issue number1-2
DOIs
Publication statusPublished - 2007 Jul 31

Keywords

  • Electronic transport
  • Grain boundary
  • Insulators
  • Semiconductors
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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