Details
| Original language | English |
|---|---|
| Pages (from-to) | 101-106 |
| Number of pages | 6 |
| Journal | Journal of solid state chemistry |
| Volume | 201 |
| Early online date | 26 Feb 2013 |
| Publication status | Published - May 2013 |
Abstract
The series of (Ba0.5Sr0.5)(Co0.8Fe 0.2)1-zZrzO3-δ (z=0, 0.01, 0.03, 0.05, 0.07, and 0.09) was synthesized by a sol-gel method. The materials with a zirconium content up to 3 mol% were found to be single phase. Further increase results in formation of a mixed (Ba,Sr)ZrO3 by-phase, which was found along the grain boundaries and in the grains. With increasing zirconium content the oxygen permeation flux decreases considerably. The effect of the zirconium substitution on the long-term phase stability was investigated by long-term oxygen permeation experiments and X-ray diffraction. A slight stabilization of the oxygen flux of (Ba0.5Sr0.5)(Co 0.8Fe0.2)0.97Zr0.03O 3-δ was found after 180 h at 1023 K. However, all compositions show a decrease in permeation flux with time, but the pure BSCF membrane exhibited the strongest drop after 180 h of operation. The decomposition products of the cubic perovskite phase were found to be a hexagonal Ba 0.5±xSr0.5±xCoO3 and a rhombohedral Ba1-xSrxCo2-yFeyO 5-δ.
Keywords
- BSCF, Long-term phase stability, Mixed ionic electronic conductors, Oxygen permeation, Transmission electron microscopy
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemistry(all)
- Inorganic Chemistry
- Materials Science(all)
- Materials Chemistry
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In: Journal of solid state chemistry, Vol. 201, 05.2013, p. 101-106.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of Zr-doped BSCF perovskite membrane for oxygen separation in the intermediate temperature range
AU - Ravkina, Olga
AU - Klande, Tobias
AU - Feldhoff, Armin
N1 - Funding Information: The authors greatly acknowledge financial support from the Chinese-German Centre for Science (GZ676) and the Deutsche Forschungsgemeinschaft (FE 928/4-1) and fruitful discussions with Prof. Jürgen Caro.
PY - 2013/5
Y1 - 2013/5
N2 - The series of (Ba0.5Sr0.5)(Co0.8Fe 0.2)1-zZrzO3-δ (z=0, 0.01, 0.03, 0.05, 0.07, and 0.09) was synthesized by a sol-gel method. The materials with a zirconium content up to 3 mol% were found to be single phase. Further increase results in formation of a mixed (Ba,Sr)ZrO3 by-phase, which was found along the grain boundaries and in the grains. With increasing zirconium content the oxygen permeation flux decreases considerably. The effect of the zirconium substitution on the long-term phase stability was investigated by long-term oxygen permeation experiments and X-ray diffraction. A slight stabilization of the oxygen flux of (Ba0.5Sr0.5)(Co 0.8Fe0.2)0.97Zr0.03O 3-δ was found after 180 h at 1023 K. However, all compositions show a decrease in permeation flux with time, but the pure BSCF membrane exhibited the strongest drop after 180 h of operation. The decomposition products of the cubic perovskite phase were found to be a hexagonal Ba 0.5±xSr0.5±xCoO3 and a rhombohedral Ba1-xSrxCo2-yFeyO 5-δ.
AB - The series of (Ba0.5Sr0.5)(Co0.8Fe 0.2)1-zZrzO3-δ (z=0, 0.01, 0.03, 0.05, 0.07, and 0.09) was synthesized by a sol-gel method. The materials with a zirconium content up to 3 mol% were found to be single phase. Further increase results in formation of a mixed (Ba,Sr)ZrO3 by-phase, which was found along the grain boundaries and in the grains. With increasing zirconium content the oxygen permeation flux decreases considerably. The effect of the zirconium substitution on the long-term phase stability was investigated by long-term oxygen permeation experiments and X-ray diffraction. A slight stabilization of the oxygen flux of (Ba0.5Sr0.5)(Co 0.8Fe0.2)0.97Zr0.03O 3-δ was found after 180 h at 1023 K. However, all compositions show a decrease in permeation flux with time, but the pure BSCF membrane exhibited the strongest drop after 180 h of operation. The decomposition products of the cubic perovskite phase were found to be a hexagonal Ba 0.5±xSr0.5±xCoO3 and a rhombohedral Ba1-xSrxCo2-yFeyO 5-δ.
KW - BSCF
KW - Long-term phase stability
KW - Mixed ionic electronic conductors
KW - Oxygen permeation
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84874940382&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2013.02.023
DO - 10.1016/j.jssc.2013.02.023
M3 - Article
AN - SCOPUS:84874940382
VL - 201
SP - 101
EP - 106
JO - Journal of solid state chemistry
JF - Journal of solid state chemistry
SN - 0022-4596
ER -