Details
| Original language | English |
|---|---|
| Pages (from-to) | 20-26 |
| Number of pages | 7 |
| Journal | Journal of membrane science |
| Volume | 262 |
| Issue number | 1-2 |
| Publication status | Published - 1 Oct 2005 |
Abstract
The high temperature phase structures of the perovskite-type oxide Ba 0.5Sr0.5Co0.8Fe0.2O 3-δ (BSCF) were characterized by in situ high-temperature X-ray diffraction, which revealed that BSCF exhibits a good phase reversibility and structure stability in air from room temperature to 1273 K. The XRD patterns of BSCF oxide at 1173 K in different atmospheres (air, 2% O2 in Ar and pure Ar) indicated that BSCF possesses an excellent phase stability at high temperatures not only in air but also in pure Ar. From the plot of the lattice constant against the temperature, the thermal expansion coefficient of BSCF was determined to be 11.5 × 10-6 K-1, which is smaller than that of SrCo0.8Fe0.2O3-δ (SCF) (17.9 × 10-6 K-1). Microstructures of the membranes sintered under different conditions were characterized by scanning electron microscopy (SEM). The effect of microstructure on the oxygen permeation flux through BSCF was observed by measuring the oxygen permeation flux using samples sintered under different conditions. The oxygen permeation flux increased considerably with the increase of the grain size of the membrane.
Keywords
- Membrane, Mixed conductor, Oxygen separation, Perovskite
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. 262, No. 1-2, 01.10.2005, p. 20-26.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of phase structure, sintering, and permeability of perovskite-type Ba0.5Sr0.5Co0.8Fe 0.2O3-δ membranes
AU - Wang, Haihui
AU - Tablet, Cristina
AU - Feldhoff, Armin
AU - Caro, Jürgen
N1 - Funding Information: H. Wang greatly thanks the Alexander von Humboldt Foundation for the financial support. The authors also gratefully acknowledge the financial support of the BMBF for project 03C0343A under the auspices of ConNeCat.
PY - 2005/10/1
Y1 - 2005/10/1
N2 - The high temperature phase structures of the perovskite-type oxide Ba 0.5Sr0.5Co0.8Fe0.2O 3-δ (BSCF) were characterized by in situ high-temperature X-ray diffraction, which revealed that BSCF exhibits a good phase reversibility and structure stability in air from room temperature to 1273 K. The XRD patterns of BSCF oxide at 1173 K in different atmospheres (air, 2% O2 in Ar and pure Ar) indicated that BSCF possesses an excellent phase stability at high temperatures not only in air but also in pure Ar. From the plot of the lattice constant against the temperature, the thermal expansion coefficient of BSCF was determined to be 11.5 × 10-6 K-1, which is smaller than that of SrCo0.8Fe0.2O3-δ (SCF) (17.9 × 10-6 K-1). Microstructures of the membranes sintered under different conditions were characterized by scanning electron microscopy (SEM). The effect of microstructure on the oxygen permeation flux through BSCF was observed by measuring the oxygen permeation flux using samples sintered under different conditions. The oxygen permeation flux increased considerably with the increase of the grain size of the membrane.
AB - The high temperature phase structures of the perovskite-type oxide Ba 0.5Sr0.5Co0.8Fe0.2O 3-δ (BSCF) were characterized by in situ high-temperature X-ray diffraction, which revealed that BSCF exhibits a good phase reversibility and structure stability in air from room temperature to 1273 K. The XRD patterns of BSCF oxide at 1173 K in different atmospheres (air, 2% O2 in Ar and pure Ar) indicated that BSCF possesses an excellent phase stability at high temperatures not only in air but also in pure Ar. From the plot of the lattice constant against the temperature, the thermal expansion coefficient of BSCF was determined to be 11.5 × 10-6 K-1, which is smaller than that of SrCo0.8Fe0.2O3-δ (SCF) (17.9 × 10-6 K-1). Microstructures of the membranes sintered under different conditions were characterized by scanning electron microscopy (SEM). The effect of microstructure on the oxygen permeation flux through BSCF was observed by measuring the oxygen permeation flux using samples sintered under different conditions. The oxygen permeation flux increased considerably with the increase of the grain size of the membrane.
KW - Membrane
KW - Mixed conductor
KW - Oxygen separation
KW - Perovskite
UR - http://www.scopus.com/inward/record.url?scp=24344507747&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2005.03.046
DO - 10.1016/j.memsci.2005.03.046
M3 - Article
AN - SCOPUS:24344507747
VL - 262
SP - 20
EP - 26
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
IS - 1-2
ER -