Details
| Original language | English |
|---|---|
| Pages (from-to) | 1129-1136 |
| Number of pages | 8 |
| Journal | Journal of the European Ceramic Society |
| Volume | 33 |
| Issue number | 6 |
| Early online date | 27 Dec 2012 |
| Publication status | Published - Jun 2013 |
Abstract
The effect of grain size on oxygen permeation properties of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and SrCo0.8Fe0.2O3-δ (SCF) membranes was investigated by variation of the dwell time. The membrane microstructure was examined by field-emission scanning microscopy (FE-SEM) and then evaluated using a statistical approach. With longer dwell times the grain growth was stimulated and leaded to grains with a narrower size distribution. The grains of SCF (average size from 11.3 to 19.9μm) were found to be smaller than those of BSCF (average size from 13.9 to 41.3μm). The oxygen permeation flux of BSCF membranes was found to be independent of grain size in the range from 24 to 42μm. However, membranes with smaller grains (13.9μm) show a decreased oxygen permeation flux. For the SCF membranes a decrease in permeation flux with larger grains was observed for average grain sizes between 11.3 and 19.9μm. By transmission electron microscopy (TEM) formation of an oxygen ordered SrCo0.8Fe0.2O2.5 brownmillerite by-phase could be observed at the oxygen-depleted sweep side of the membrane.
Keywords
- Grain size, Microstructure, Oxygen permeation, Scanning electron microscopy, Transmission electron microscopy
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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In: Journal of the European Ceramic Society, Vol. 33, No. 6, 06.2013, p. 1129-1136.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of microstructure on oxygen permeation of Ba0.5Sr0.5Co0.8Fe0.2O3-δ and SrCo0.8Fe0.2O3-δ membranes
AU - Klande, Tobias
AU - Ravkina, Olga
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 - 2013/6
Y1 - 2013/6
N2 - The effect of grain size on oxygen permeation properties of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and SrCo0.8Fe0.2O3-δ (SCF) membranes was investigated by variation of the dwell time. The membrane microstructure was examined by field-emission scanning microscopy (FE-SEM) and then evaluated using a statistical approach. With longer dwell times the grain growth was stimulated and leaded to grains with a narrower size distribution. The grains of SCF (average size from 11.3 to 19.9μm) were found to be smaller than those of BSCF (average size from 13.9 to 41.3μm). The oxygen permeation flux of BSCF membranes was found to be independent of grain size in the range from 24 to 42μm. However, membranes with smaller grains (13.9μm) show a decreased oxygen permeation flux. For the SCF membranes a decrease in permeation flux with larger grains was observed for average grain sizes between 11.3 and 19.9μm. By transmission electron microscopy (TEM) formation of an oxygen ordered SrCo0.8Fe0.2O2.5 brownmillerite by-phase could be observed at the oxygen-depleted sweep side of the membrane.
AB - The effect of grain size on oxygen permeation properties of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and SrCo0.8Fe0.2O3-δ (SCF) membranes was investigated by variation of the dwell time. The membrane microstructure was examined by field-emission scanning microscopy (FE-SEM) and then evaluated using a statistical approach. With longer dwell times the grain growth was stimulated and leaded to grains with a narrower size distribution. The grains of SCF (average size from 11.3 to 19.9μm) were found to be smaller than those of BSCF (average size from 13.9 to 41.3μm). The oxygen permeation flux of BSCF membranes was found to be independent of grain size in the range from 24 to 42μm. However, membranes with smaller grains (13.9μm) show a decreased oxygen permeation flux. For the SCF membranes a decrease in permeation flux with larger grains was observed for average grain sizes between 11.3 and 19.9μm. By transmission electron microscopy (TEM) formation of an oxygen ordered SrCo0.8Fe0.2O2.5 brownmillerite by-phase could be observed at the oxygen-depleted sweep side of the membrane.
KW - Grain size
KW - Microstructure
KW - Oxygen permeation
KW - Scanning electron microscopy
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84873099612&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2012.11.023
DO - 10.1016/j.jeurceramsoc.2012.11.023
M3 - Article
AN - SCOPUS:84873099612
VL - 33
SP - 1129
EP - 1136
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 6
ER -