Details
| Original language | English |
|---|---|
| Number of pages | 14 |
| Journal | Journal of Solid State Electrochemistry |
| Early online date | 30 May 2024 |
| Publication status | E-pub ahead of print - 30 May 2024 |
Abstract
Textured La2NiO4+δ membranes were fabricated by pressureless sintering in air using uniaxially pressed powder mixtures consisting of fine-grained equiaxial La2NiO4+δ matrix particles and plate-like La2NiO4+δ template particles in varying mass ratios. The template particles, obtained by molten-flux synthesis, were aligned perpendicular to the pressing direction. Subsequent sintering resulted in ceramic membranes with enhanced texturing along the crystallographic c-axis of La2NiO4+δ. X-ray diffraction patterns revealed a direct relationship: The higher the fraction of template particles in the ceramics, the more pronounced the c-axis texturing. The Lotgering orientation factor, calculated from the X-ray diffraction patterns, also demonstrated that an increasing proportion of the template particles in the ceramic materials led to stronger (00l) reflections. Additionally, the texturing degree in selected membranes was quantified by measuring pole figures. Scanning electron micrographs of the La2NiO4+δ samples with a small amount of template particles showed some individual plate-like grains well integrated into the matrix. Membrane porosity was observed to increase with higher quantities of template particles utilized. This was supported by measuring the membrane density using the Archimedes method: The larger the proportion of template particles in the ceramics, the lower the sample density. Besides, the presence of lanthanum, nickel, and oxygen in the membranes was confirmed by energy-dispersive X-ray spectroscopy. Finally, the effect of texturing on the oxygen permeation performance of the La2NiO4+δ membranes, in which the template particles are arranged along their c-axis, parallel to the oxygen flux direction, was investigated. The results indicated a reduction in oxygen flux as the level of c-axis texturing increased. Graphical abstract: (Figure presented.)
Keywords
- Anisotropy, Lanthanum nickelate, Microstructure, Oxygen permeation, Ruddlesden-Popper phase, Textured ceramics
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Energy(all)
- Energy Engineering and Power Technology
- Chemistry(all)
- Electrochemistry
- Engineering(all)
- Electrical and Electronic Engineering
- Materials Science(all)
- Materials Chemistry
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In: Journal of Solid State Electrochemistry, 30.05.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Towards the development of textured polycrystalline La2NiO4+δ membranes and their oxygen-transporting properties
AU - Escobar Cano, Giamper
AU - Zhao, Zhijun
AU - Riebesehl, Fabian
AU - Stölting, Oliver
AU - Breidenstein, Bernd
AU - Feldhoff, Armin
N1 - Publisher Copyright: © The Author(s) 2024.
PY - 2024/5/30
Y1 - 2024/5/30
N2 - Textured La2NiO4+δ membranes were fabricated by pressureless sintering in air using uniaxially pressed powder mixtures consisting of fine-grained equiaxial La2NiO4+δ matrix particles and plate-like La2NiO4+δ template particles in varying mass ratios. The template particles, obtained by molten-flux synthesis, were aligned perpendicular to the pressing direction. Subsequent sintering resulted in ceramic membranes with enhanced texturing along the crystallographic c-axis of La2NiO4+δ. X-ray diffraction patterns revealed a direct relationship: The higher the fraction of template particles in the ceramics, the more pronounced the c-axis texturing. The Lotgering orientation factor, calculated from the X-ray diffraction patterns, also demonstrated that an increasing proportion of the template particles in the ceramic materials led to stronger (00l) reflections. Additionally, the texturing degree in selected membranes was quantified by measuring pole figures. Scanning electron micrographs of the La2NiO4+δ samples with a small amount of template particles showed some individual plate-like grains well integrated into the matrix. Membrane porosity was observed to increase with higher quantities of template particles utilized. This was supported by measuring the membrane density using the Archimedes method: The larger the proportion of template particles in the ceramics, the lower the sample density. Besides, the presence of lanthanum, nickel, and oxygen in the membranes was confirmed by energy-dispersive X-ray spectroscopy. Finally, the effect of texturing on the oxygen permeation performance of the La2NiO4+δ membranes, in which the template particles are arranged along their c-axis, parallel to the oxygen flux direction, was investigated. The results indicated a reduction in oxygen flux as the level of c-axis texturing increased. Graphical abstract: (Figure presented.)
AB - Textured La2NiO4+δ membranes were fabricated by pressureless sintering in air using uniaxially pressed powder mixtures consisting of fine-grained equiaxial La2NiO4+δ matrix particles and plate-like La2NiO4+δ template particles in varying mass ratios. The template particles, obtained by molten-flux synthesis, were aligned perpendicular to the pressing direction. Subsequent sintering resulted in ceramic membranes with enhanced texturing along the crystallographic c-axis of La2NiO4+δ. X-ray diffraction patterns revealed a direct relationship: The higher the fraction of template particles in the ceramics, the more pronounced the c-axis texturing. The Lotgering orientation factor, calculated from the X-ray diffraction patterns, also demonstrated that an increasing proportion of the template particles in the ceramic materials led to stronger (00l) reflections. Additionally, the texturing degree in selected membranes was quantified by measuring pole figures. Scanning electron micrographs of the La2NiO4+δ samples with a small amount of template particles showed some individual plate-like grains well integrated into the matrix. Membrane porosity was observed to increase with higher quantities of template particles utilized. This was supported by measuring the membrane density using the Archimedes method: The larger the proportion of template particles in the ceramics, the lower the sample density. Besides, the presence of lanthanum, nickel, and oxygen in the membranes was confirmed by energy-dispersive X-ray spectroscopy. Finally, the effect of texturing on the oxygen permeation performance of the La2NiO4+δ membranes, in which the template particles are arranged along their c-axis, parallel to the oxygen flux direction, was investigated. The results indicated a reduction in oxygen flux as the level of c-axis texturing increased. Graphical abstract: (Figure presented.)
KW - Anisotropy
KW - Lanthanum nickelate
KW - Microstructure
KW - Oxygen permeation
KW - Ruddlesden-Popper phase
KW - Textured ceramics
UR - http://www.scopus.com/inward/record.url?scp=85194704056&partnerID=8YFLogxK
U2 - 10.1007/s10008-024-05924-4
DO - 10.1007/s10008-024-05924-4
M3 - Article
AN - SCOPUS:85194704056
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
SN - 1432-8488
ER -