Conductivity and expansion at high temperature in Sr0.7La 0.3TiO3-α prepared under reducing atmosphere

S. Hashimoto, L. Kindermann, P. H. Larsen, F. W. Poulsen, M. Mogensen

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43 Citations (Scopus)


Sr0.7La0.3TiO3-α specimens were prepared in reducing atmosphere, and the structural and electrical properties were studied. The lattice parameter of Sr0.7La0.3TiO 3-α at room temperature was larger than that expected from Vegard's law between SrTiO3 and LaTiO3 due to the reductive expansion. The conductivity of this specimen was 100 S cm-1 at 1000°C, p O 2 = 10-13 Pa. However, the conductivity was not preserved after an oxidation-reduction cycle. Over p O 2 = 102 Pa, the conductivity drastically dropped with increasing p O 2. The thermal expansion coefficient of Sr0.7La0.3TiO3-α was 11.8 × 10-6 K-1 in 9% H2/N2 (room temperature - 1000°C). In this Sr0.7La0.3TiO 3-α, the chemical expansion on oxidation reached Δl/lo = 0.51%, when changing p O 2 from 10-11 Pa to 2 × 104 Pa (air) at 1000°C.

Original languageEnglish
Pages (from-to)103-107
Number of pages5
JournalJournal of Electroceramics
Issue number2
Publication statusPublished - 2006 Mar


  • Conductivity
  • Dilatometry
  • Donor doping
  • Strontium titanate
  • Vegard's law

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry


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