Details
| Original language | English |
|---|---|
| Pages (from-to) | 137-144 |
| Number of pages | 8 |
| Journal | Journal of membrane science |
| Volume | 316 |
| Issue number | 1-2 |
| Early online date | 6 Oct 2007 |
| Publication status | Published - 15 May 2008 |
Abstract
Perovskite-type membranes of (Ba0.5Sr0.5)(Co0.8Fe0.2)O3-δ (BSCF) and (Ba0.5Sr0.5)(Fe0.8Zn0.2)O3-δ (BSFZ) were successfully prepared via liquid-phase sintering using BN as sintering aid. The obtained membranes were examined via powder X-ray diffraction pattern (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and oxygen permeation experiments. It has emerged that the use of BN as sintering aid lowers sintering temperatures in order to obtain dense membranes with relative densities in the range of 93-96% as proven by the Archimedes method. It was further shown that the perovskite structure could be maintained after sintering with BN. Additionally, BN was completely removed from the sintered membranes. Investigation of the microstructure revealed that the average grain size of the membranes was influenced by the amount of BN added prior the sintering process. It was found that large amounts of BN effectively lower the average grain size. Oxygen permeation experiments have shown that the lower the average grain size the lower the oxygen permeation performance, particularly in the case of BSCF. Transmission electron microscopy revealed that no evidence for an amorphous layer or any other interfacial phase in the grain boundary is present.
Keywords
- BN, BSCF, BSFZ, Grain boundaries, Grain size distribution, Liquid-phase sintering, Oxygen permeation, Perovskite, Transmission electron microscopy
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Materials Science(all)
- General Materials Science
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Journal of membrane science, Vol. 316, No. 1-2, 15.05.2008, p. 137-144.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Grain boundaries as barrier for oxygen transport in perovskite-type membranes
AU - Arnold, Mirko
AU - Martynczuk, Julia
AU - Efimov, Konstantin
AU - Wang, Haihui
AU - Feldhoff, Armin
N1 - Funding Information: The authors greatly acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG) under grant number FE 928/1-1 and fruitful discussions with Prof. Jürgen Caro.
PY - 2008/5/15
Y1 - 2008/5/15
N2 - Perovskite-type membranes of (Ba0.5Sr0.5)(Co0.8Fe0.2)O3-δ (BSCF) and (Ba0.5Sr0.5)(Fe0.8Zn0.2)O3-δ (BSFZ) were successfully prepared via liquid-phase sintering using BN as sintering aid. The obtained membranes were examined via powder X-ray diffraction pattern (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and oxygen permeation experiments. It has emerged that the use of BN as sintering aid lowers sintering temperatures in order to obtain dense membranes with relative densities in the range of 93-96% as proven by the Archimedes method. It was further shown that the perovskite structure could be maintained after sintering with BN. Additionally, BN was completely removed from the sintered membranes. Investigation of the microstructure revealed that the average grain size of the membranes was influenced by the amount of BN added prior the sintering process. It was found that large amounts of BN effectively lower the average grain size. Oxygen permeation experiments have shown that the lower the average grain size the lower the oxygen permeation performance, particularly in the case of BSCF. Transmission electron microscopy revealed that no evidence for an amorphous layer or any other interfacial phase in the grain boundary is present.
AB - Perovskite-type membranes of (Ba0.5Sr0.5)(Co0.8Fe0.2)O3-δ (BSCF) and (Ba0.5Sr0.5)(Fe0.8Zn0.2)O3-δ (BSFZ) were successfully prepared via liquid-phase sintering using BN as sintering aid. The obtained membranes were examined via powder X-ray diffraction pattern (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and oxygen permeation experiments. It has emerged that the use of BN as sintering aid lowers sintering temperatures in order to obtain dense membranes with relative densities in the range of 93-96% as proven by the Archimedes method. It was further shown that the perovskite structure could be maintained after sintering with BN. Additionally, BN was completely removed from the sintered membranes. Investigation of the microstructure revealed that the average grain size of the membranes was influenced by the amount of BN added prior the sintering process. It was found that large amounts of BN effectively lower the average grain size. Oxygen permeation experiments have shown that the lower the average grain size the lower the oxygen permeation performance, particularly in the case of BSCF. Transmission electron microscopy revealed that no evidence for an amorphous layer or any other interfacial phase in the grain boundary is present.
KW - BN
KW - BSCF
KW - BSFZ
KW - Grain boundaries
KW - Grain size distribution
KW - Liquid-phase sintering
KW - Oxygen permeation
KW - Perovskite
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=42949170640&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2007.10.002
DO - 10.1016/j.memsci.2007.10.002
M3 - Article
AN - SCOPUS:42949170640
VL - 316
SP - 137
EP - 144
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
IS - 1-2
ER -