Details
| Original language | English |
|---|---|
| Pages (from-to) | 635-640 |
| Number of pages | 6 |
| Journal | Chemistry of Materials |
| Volume | 21 |
| Issue number | 4 |
| Early online date | 27 Jan 2009 |
| Publication status | Published - 24 Feb 2009 |
Abstract
The temperature-dependent local charge disproportion in the (Ba 0.5Sr0.5)(Co0.8Fe0.2)O 3-δ perovskite-type oxide (denoted as BSCF) was monitored by in situ electron energy-loss spectroscopy applying monochromized electrons in a transmission electron microscope. At elevated temperatures, oxygen is removed from the crystal lattice in these perovskite-type oxides that is due to a reduction of the transition metal sites. To determine the site-specific valence in the BSCF perovskite, we measured the cobalt and iron L-edges and the oxygen K-edge on increasing the temperature from 298 to 1223 K. It was found that the loss of oxygen at elevated temperatures is mainly due to a reduction of the cobalt site compared to the iron site. The understanding of the site specific redox behavior in this material is important in explaining its long-term instability at intermediate temperatures, which has not been elucidated priory this study.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Chemical Engineering(all)
- General Chemical Engineering
- Materials Science(all)
- Materials Chemistry
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In: Chemistry of Materials, Vol. 21, No. 4, 24.02.2009, p. 635-640.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Local charge disproportion in a high-performance perovskite
AU - Arnold, Mirko
AU - Xu, Qiang
AU - Tichelaar, Frans D.
AU - Feldhoff, Armin
PY - 2009/2/24
Y1 - 2009/2/24
N2 - The temperature-dependent local charge disproportion in the (Ba 0.5Sr0.5)(Co0.8Fe0.2)O 3-δ perovskite-type oxide (denoted as BSCF) was monitored by in situ electron energy-loss spectroscopy applying monochromized electrons in a transmission electron microscope. At elevated temperatures, oxygen is removed from the crystal lattice in these perovskite-type oxides that is due to a reduction of the transition metal sites. To determine the site-specific valence in the BSCF perovskite, we measured the cobalt and iron L-edges and the oxygen K-edge on increasing the temperature from 298 to 1223 K. It was found that the loss of oxygen at elevated temperatures is mainly due to a reduction of the cobalt site compared to the iron site. The understanding of the site specific redox behavior in this material is important in explaining its long-term instability at intermediate temperatures, which has not been elucidated priory this study.
AB - The temperature-dependent local charge disproportion in the (Ba 0.5Sr0.5)(Co0.8Fe0.2)O 3-δ perovskite-type oxide (denoted as BSCF) was monitored by in situ electron energy-loss spectroscopy applying monochromized electrons in a transmission electron microscope. At elevated temperatures, oxygen is removed from the crystal lattice in these perovskite-type oxides that is due to a reduction of the transition metal sites. To determine the site-specific valence in the BSCF perovskite, we measured the cobalt and iron L-edges and the oxygen K-edge on increasing the temperature from 298 to 1223 K. It was found that the loss of oxygen at elevated temperatures is mainly due to a reduction of the cobalt site compared to the iron site. The understanding of the site specific redox behavior in this material is important in explaining its long-term instability at intermediate temperatures, which has not been elucidated priory this study.
UR - http://www.scopus.com/inward/record.url?scp=65249125116&partnerID=8YFLogxK
U2 - 10.1021/cm802779f
DO - 10.1021/cm802779f
M3 - Article
AN - SCOPUS:65249125116
VL - 21
SP - 635
EP - 640
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 4
ER -