Details
| Original language | English |
|---|---|
| Pages (from-to) | 3451-3456 |
| Number of pages | 6 |
| Journal | Journal of the European Ceramic Society |
| Volume | 36 |
| Issue number | 14 |
| Early online date | 1 Jun 2016 |
| Publication status | Published - 1 Nov 2016 |
Abstract
Partial internal reduction is observed of NiO precipitates in a matrix of a Ruddlesden-Popper type mixed ionic-electronic conducting ceramic with composition of (Pr0.9La0.1)2.0Ni0.74Cu0.21Ga0.05O4+δ during the cooling from sintering temperature to room temperature in ambient air. A metallic Ni interlayer between NiO and the oxide matrix is demonstrated using scanning transmission electron microscopy combined with electron energy-loss spectroscopy. The possible formation mechanism for the metallic Ni is discussed in light of the partial internal reduction during the cooling process in ambient air. The drop of temperature during cooling process in ambient air causes a drop of the oxygen chemical potential in the Ruddlesden-Popper type oxide ceramic, which acts as an oxygen absorber. Thus, the local oxygen chemical potential at the internal interface between Ruddlesden-Popper type matrix and NiO precipitate can fall below the stability limit of the later. As consequence, NiO is partially reduced to metallic Ni at the interface.
Keywords
- Ambient air, Cooling process, Internal, Mixed ionic-electronic conductor, Reduction
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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In: Journal of the European Ceramic Society, Vol. 36, No. 14, 01.11.2016, p. 3451-3456.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ambient air partial internal reduction of NiO in a mixed ionic-electronic conducting ceramic
AU - Xue, Jian
AU - Feldhoff, Armin
N1 - Funding Information: J.X. acknowledges financial support from the China Scholarship Council (CSC) (File No. 201306150011). Financial support by the Deutsche Forschungsgemeinschaft (DFG) (No. FE928/7-1 ) is appreciated. The authors also acknowledge F. Steinbach for technical support. Publisher Copyright: © 2016 Elsevier Ltd
PY - 2016/11/1
Y1 - 2016/11/1
N2 - Partial internal reduction is observed of NiO precipitates in a matrix of a Ruddlesden-Popper type mixed ionic-electronic conducting ceramic with composition of (Pr0.9La0.1)2.0Ni0.74Cu0.21Ga0.05O4+δ during the cooling from sintering temperature to room temperature in ambient air. A metallic Ni interlayer between NiO and the oxide matrix is demonstrated using scanning transmission electron microscopy combined with electron energy-loss spectroscopy. The possible formation mechanism for the metallic Ni is discussed in light of the partial internal reduction during the cooling process in ambient air. The drop of temperature during cooling process in ambient air causes a drop of the oxygen chemical potential in the Ruddlesden-Popper type oxide ceramic, which acts as an oxygen absorber. Thus, the local oxygen chemical potential at the internal interface between Ruddlesden-Popper type matrix and NiO precipitate can fall below the stability limit of the later. As consequence, NiO is partially reduced to metallic Ni at the interface.
AB - Partial internal reduction is observed of NiO precipitates in a matrix of a Ruddlesden-Popper type mixed ionic-electronic conducting ceramic with composition of (Pr0.9La0.1)2.0Ni0.74Cu0.21Ga0.05O4+δ during the cooling from sintering temperature to room temperature in ambient air. A metallic Ni interlayer between NiO and the oxide matrix is demonstrated using scanning transmission electron microscopy combined with electron energy-loss spectroscopy. The possible formation mechanism for the metallic Ni is discussed in light of the partial internal reduction during the cooling process in ambient air. The drop of temperature during cooling process in ambient air causes a drop of the oxygen chemical potential in the Ruddlesden-Popper type oxide ceramic, which acts as an oxygen absorber. Thus, the local oxygen chemical potential at the internal interface between Ruddlesden-Popper type matrix and NiO precipitate can fall below the stability limit of the later. As consequence, NiO is partially reduced to metallic Ni at the interface.
KW - Ambient air
KW - Cooling process
KW - Internal
KW - Mixed ionic-electronic conductor
KW - Reduction
UR - http://www.scopus.com/inward/record.url?scp=84976402743&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2016.05.023
DO - 10.1016/j.jeurceramsoc.2016.05.023
M3 - Article
AN - SCOPUS:84976402743
VL - 36
SP - 3451
EP - 3456
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 14
ER -