Details
| Original language | English |
|---|---|
| Pages (from-to) | 76-88 |
| Number of pages | 13 |
| Journal | Journal of membrane science |
| Volume | 520 |
| Early online date | 27 Jul 2016 |
| Publication status | Published - 15 Dec 2016 |
Abstract
The influence of elevated oxygen pressure (from 1 to 50 bar) on phase separation in Ba0.5Sr0.5Co0.8Fe0.2O3−δ(BSCF) cubic perovskite was investigated in the range of 300to 1300 K. X-ray diffraction and thermogravimetric analysis revealed two separation processes occurring in the high temperature (HT), ~1043 K, and low temperature (LT), ~713 K, ranges. Increasing oxygen pressure shifts slightly the LT phase separation to lower temperature, but has a rather minor effect on the volume fraction growth of the secondary phase. Phase transformation in the HT range is a slow process and the degree of decomposition is strongly influenced by the cooling rate from higher temperatures. On the contrary, the LT separation is relatively fast and is essentially independent of the cooling rate. The BSCF ceramics thermally treated at p(O2)=50 bar was analyzed by different electron microscopy techniques. The structures of separation products were identified as trigonal Ba3Co10O17-like lamellae and 2H-hexagonal Ba0.5±xSr0.5±xCoO3−δ perovskite, respectively.
Keywords
- BaSrCoFeO, Electron microscopy, High oxygen pressure, Oxygen nonstoichiometry, Phase decomposition
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. 520, 15.12.2016, p. 76-88.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phase separation in BSCF perovskite under elevated oxygen pressures ranging from 1 to 50 bar
AU - Ravkina, Olga
AU - Yaremchenko, Aleksey
AU - Feldhoff, Armin
N1 - Funding Information: O.R. and A.F. acknowledge financial support by the Deutsche Forschungs-gemeinschaft (DFG) under grant FE928/7-1 . We also acknowledge Frank Steinbach for his support during TEM investigations and fruitful discussions. A.Y. would like to acknowledge support from the FCT , Portugal (project IF/01072/2013/CP1162/CT0001 and project CICECO - Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (FCT ref. UID/CTM/50011/2013 ) financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement).
PY - 2016/12/15
Y1 - 2016/12/15
N2 - The influence of elevated oxygen pressure (from 1 to 50 bar) on phase separation in Ba0.5Sr0.5Co0.8Fe0.2O3−δ(BSCF) cubic perovskite was investigated in the range of 300to 1300 K. X-ray diffraction and thermogravimetric analysis revealed two separation processes occurring in the high temperature (HT), ~1043 K, and low temperature (LT), ~713 K, ranges. Increasing oxygen pressure shifts slightly the LT phase separation to lower temperature, but has a rather minor effect on the volume fraction growth of the secondary phase. Phase transformation in the HT range is a slow process and the degree of decomposition is strongly influenced by the cooling rate from higher temperatures. On the contrary, the LT separation is relatively fast and is essentially independent of the cooling rate. The BSCF ceramics thermally treated at p(O2)=50 bar was analyzed by different electron microscopy techniques. The structures of separation products were identified as trigonal Ba3Co10O17-like lamellae and 2H-hexagonal Ba0.5±xSr0.5±xCoO3−δ perovskite, respectively.
AB - The influence of elevated oxygen pressure (from 1 to 50 bar) on phase separation in Ba0.5Sr0.5Co0.8Fe0.2O3−δ(BSCF) cubic perovskite was investigated in the range of 300to 1300 K. X-ray diffraction and thermogravimetric analysis revealed two separation processes occurring in the high temperature (HT), ~1043 K, and low temperature (LT), ~713 K, ranges. Increasing oxygen pressure shifts slightly the LT phase separation to lower temperature, but has a rather minor effect on the volume fraction growth of the secondary phase. Phase transformation in the HT range is a slow process and the degree of decomposition is strongly influenced by the cooling rate from higher temperatures. On the contrary, the LT separation is relatively fast and is essentially independent of the cooling rate. The BSCF ceramics thermally treated at p(O2)=50 bar was analyzed by different electron microscopy techniques. The structures of separation products were identified as trigonal Ba3Co10O17-like lamellae and 2H-hexagonal Ba0.5±xSr0.5±xCoO3−δ perovskite, respectively.
KW - BaSrCoFeO
KW - Electron microscopy
KW - High oxygen pressure
KW - Oxygen nonstoichiometry
KW - Phase decomposition
UR - http://www.scopus.com/inward/record.url?scp=84982748084&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2016.07.047
DO - 10.1016/j.memsci.2016.07.047
M3 - Article
AN - SCOPUS:84982748084
VL - 520
SP - 76
EP - 88
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
ER -