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

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

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
Volume16
Issue number2
DOIs
Publication statusPublished - 2006 Mar

Keywords

  • 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

Fingerprint Dive into the research topics of 'Conductivity and expansion at high temperature in Sr<sub>0.7</sub>La <sub>0.3</sub>TiO<sub>3-α</sub> prepared under reducing atmosphere'. Together they form a unique fingerprint.

Cite this