High temperature transport properties in SrTiO3 under an oxygen potential gradient

Tatsuya Kawada, Tomoyasu Watanabe, Atsushi Kaimai, Ken Ichi Kawamura, Yutaka Nigara, Junichiro Mizusaki

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Electrical transport properties were investigated in a single crystalline SrTiO3 sample. The electronic conductivity was determined to be 4.0 × 10-3 P1/4O2 + 3.0 × 10-6 P-1/4O2 at 1173 K by a four terminal method. The sample was placed under an oxygen potential gradient, and the electromotive force and the current-voltage behaviour were investigated. Oxide ion conductivity was estimated to be 2.5 × 10-5 S cm-2 comparing the emf data with the theoretical values. The average conductivity was explained by a calculation based on local thermodynamic equilibrium and local charge neutrality. Under high applied voltages, a nonlinear current-voltage relationship was observed. Attempts were made to explain the nonlinearity considering the redistribution of oxide ion vacancy in the bulk and oxygen blocking effect at the electrode. The oxygen potential at the polarized electrode was estimated and compared with the oxide ion current.

Original languageEnglish
Pages (from-to)391-402
Number of pages12
JournalSolid State Ionics
Volume108
Issue number1-4
DOIs
Publication statusPublished - 1998 May 1

Keywords

  • Mixed conductor
  • Nonlinear I-V curve
  • Polarization
  • Single crystal
  • SrTiO

ASJC Scopus subject areas

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

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