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

doi:10.1007/s10832-006-3490-1

Conductivity and expansion at high temperature in Sr_0.7La _0.3TiO_3-α prepared under reducing atmosphere

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

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

Sr_0.7La_0.3TiO_3-α specimens were prepared in reducing atmosphere, and the structural and electrical properties were studied. The lattice parameter of Sr_0.7La_0.3TiO _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 Sr_0.7La_0.3TiO_3-α was 11.8 × 10^-6 K^-1 in 9% H₂/N₂ (room temperature - 1000°C). In this Sr_0.7La_0.3TiO _3-α, the chemical expansion on oxidation reached Δl/l_o = 0.51%, when changing p _O ₂ from 10^-11 Pa to 2 × 10⁴ Pa (air) at 1000°C.

Original language	English
Pages (from-to)	103-107
Number of pages	5
Journal	Journal of Electroceramics
Volume	16
Issue number	2
DOIs	https://doi.org/10.1007/s10832-006-3490-1
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

Access to Document

10.1007/s10832-006-3490-1

Cite this

@article{60580461074c4624a628e4395f3da8b6,

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

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.",

keywords = "Conductivity, Dilatometry, Donor doping, Strontium titanate, Vegard's law",

author = "S. Hashimoto and L. Kindermann and Larsen, {P. H.} and Poulsen, {F. W.} and M. Mogensen",

note = "Funding Information: Acknowledgements This work was supported by the Danish Energy Agency, contract no. 1443/02-0001 EFP 2002 DK-SOFC b, Long term R&D. The help from all in the SOFC group at Ris{\o} is appreciated.",

year = "2006",

month = mar,

doi = "10.1007/s10832-006-3490-1",

language = "English",

volume = "16",

pages = "103--107",

journal = "Journal of Electroceramics",

issn = "1385-3449",

publisher = "Springer Netherlands",

number = "2",

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T1 - Conductivity and expansion at high temperature in Sr0.7La 0.3TiO3-α prepared under reducing atmosphere

AU - Hashimoto, S.

AU - Kindermann, L.

AU - Larsen, P. H.

AU - Poulsen, F. W.

AU - Mogensen, M.

N1 - Funding Information: Acknowledgements This work was supported by the Danish Energy Agency, contract no. 1443/02-0001 EFP 2002 DK-SOFC b, Long term R&D. The help from all in the SOFC group at Risø is appreciated.

PY - 2006/3

Y1 - 2006/3

N2 - 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.

AB - 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.

KW - Conductivity

KW - Dilatometry

KW - Donor doping

KW - Strontium titanate

KW - Vegard's law

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