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 language | English |
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Pages (from-to) | 103-107 |
Number of pages | 5 |
Journal | Journal of Electroceramics |
Volume | 16 |
Issue number | 2 |
DOIs | |
Publication status | Published - 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