Details
| Original language | English |
|---|---|
| Pages (from-to) | 746-751 |
| Number of pages | 6 |
| Journal | Journal of Materials Chemistry A |
| Volume | 1 |
| Issue number | 3 |
| Early online date | 25 Oct 2012 |
| Publication status | Published - 2013 |
Abstract
Partial La-substitution for Fe on the B-site of the perovskite BaFe 0.95-xLaxZr0.05O3-δ (BFLZ) was achieved by applying a sol-gel synthesis method. The highest La content in BFLZ for the formation of a pure cubic perovskite structure without any detectable impurities is about x = 0.04. It is found for the first time that the introduction of La on the B-site of a mixed oxide stabilizes the cubic structure. Furthermore, the formation of the cubic structure of BFLZ increases significantly the oxygen permeability. The maximum oxygen permeation flux is found for a La-content of x = 0.04 with the largest volume of the cubic unit cell, reaching 0.63 and 1.24 cm3 (STP) min-1 cm -2 for a 1.1 mm thick membrane at 750 and 950 °C, respectively. This finding is in complete agreement with the XRD structure analysis, showing that the highest B-site La-substitution of BFLZ under conservation of the pure cubic perovskite phase without forming any foreign phase was about x = 0.04. For BFLZ with x > 0.04, the secondary phase Ba6La2Fe 4O15 forms increasingly and the oxygen permeation flux decreases. The influence of the sweep gas flow rates on the oxygen permeation flux and the oxygen ionic conductivity were found to be in good agreement with the Wagner theory, indicating the oxygen ion bulk diffusion as a rate-limiting step of oxygen transport. Stable oxygen permeation fluxes were obtained during the long-term oxygen permeation operation of the BFLZ (x = 0.04) membrane over 170 h at 750 and 950 °C, respectively.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- General Materials Science
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In: Journal of Materials Chemistry A, Vol. 1, No. 3, 2013, p. 746-751.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - B-site La-doped BaFe0.95-xLaxZr0.05O 3-δ perovskite-type membranes for oxygen separation
AU - Liang, Fangyi
AU - Partovi, Kaveh
AU - Jiang, Heqing
AU - Luo, Huixia
AU - Caro, Jürgen
PY - 2013
Y1 - 2013
N2 - Partial La-substitution for Fe on the B-site of the perovskite BaFe 0.95-xLaxZr0.05O3-δ (BFLZ) was achieved by applying a sol-gel synthesis method. The highest La content in BFLZ for the formation of a pure cubic perovskite structure without any detectable impurities is about x = 0.04. It is found for the first time that the introduction of La on the B-site of a mixed oxide stabilizes the cubic structure. Furthermore, the formation of the cubic structure of BFLZ increases significantly the oxygen permeability. The maximum oxygen permeation flux is found for a La-content of x = 0.04 with the largest volume of the cubic unit cell, reaching 0.63 and 1.24 cm3 (STP) min-1 cm -2 for a 1.1 mm thick membrane at 750 and 950 °C, respectively. This finding is in complete agreement with the XRD structure analysis, showing that the highest B-site La-substitution of BFLZ under conservation of the pure cubic perovskite phase without forming any foreign phase was about x = 0.04. For BFLZ with x > 0.04, the secondary phase Ba6La2Fe 4O15 forms increasingly and the oxygen permeation flux decreases. The influence of the sweep gas flow rates on the oxygen permeation flux and the oxygen ionic conductivity were found to be in good agreement with the Wagner theory, indicating the oxygen ion bulk diffusion as a rate-limiting step of oxygen transport. Stable oxygen permeation fluxes were obtained during the long-term oxygen permeation operation of the BFLZ (x = 0.04) membrane over 170 h at 750 and 950 °C, respectively.
AB - Partial La-substitution for Fe on the B-site of the perovskite BaFe 0.95-xLaxZr0.05O3-δ (BFLZ) was achieved by applying a sol-gel synthesis method. The highest La content in BFLZ for the formation of a pure cubic perovskite structure without any detectable impurities is about x = 0.04. It is found for the first time that the introduction of La on the B-site of a mixed oxide stabilizes the cubic structure. Furthermore, the formation of the cubic structure of BFLZ increases significantly the oxygen permeability. The maximum oxygen permeation flux is found for a La-content of x = 0.04 with the largest volume of the cubic unit cell, reaching 0.63 and 1.24 cm3 (STP) min-1 cm -2 for a 1.1 mm thick membrane at 750 and 950 °C, respectively. This finding is in complete agreement with the XRD structure analysis, showing that the highest B-site La-substitution of BFLZ under conservation of the pure cubic perovskite phase without forming any foreign phase was about x = 0.04. For BFLZ with x > 0.04, the secondary phase Ba6La2Fe 4O15 forms increasingly and the oxygen permeation flux decreases. The influence of the sweep gas flow rates on the oxygen permeation flux and the oxygen ionic conductivity were found to be in good agreement with the Wagner theory, indicating the oxygen ion bulk diffusion as a rate-limiting step of oxygen transport. Stable oxygen permeation fluxes were obtained during the long-term oxygen permeation operation of the BFLZ (x = 0.04) membrane over 170 h at 750 and 950 °C, respectively.
UR - http://www.scopus.com/inward/record.url?scp=84876541820&partnerID=8YFLogxK
U2 - 10.1039/c2ta00377e
DO - 10.1039/c2ta00377e
M3 - Article
AN - SCOPUS:84876541820
VL - 1
SP - 746
EP - 751
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 3
ER -