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Ruddlesden-Popper-type Nd2-xNi1-yCuyO4±δ layered oxides as candidate materials for MIEC-type ceramic membranes
- Source :
- Journal of the European Ceramic Society. 40:4056-4066
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Series of Nd2-xNi1-yCuyO4±δ Ruddlesden-Popper-type oxides is obtained by auto-combustion synthesis method and systematically characterized concerning phase composition, formation of solid state solution, crystal structure, oxygen content, as well as regarding transport properties and oxygen permeability when applied as mixed conducting ceramic membranes. The A-site deficiency x is discussed in terms of structural stability and its effect on the oxygen content, with ongoing modification of total electrical conductivity observed. In selected Nd2-xNi0.75Cu0.25O4±δ oxides the dominating oxygen defects at high temperatures can be changed from oxygen interstitials to vacancies by the induced A-site deficiency, which affects bulk- and surface-related transport coefficients, as it is observed in electrical conductivity relaxation studies. The optimized Nd1.9Ni0.75Cu0.25O4±δ sinters having increased ionic conductivity, as well as fine, well-sintered microstructure allow to achieve one of the higher reported oxygen fluxes for CO2-stable Ruddlesden-Popper-based ceramic membranes (e.g. 0.49 mL cm−2 min−1 at ca. 880 °C for 1.05 mm thickness).
- Subjects :
- 010302 applied physics
Materials science
chemistry.chemical_element
02 engineering and technology
Crystal structure
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Oxygen
Oxygen permeability
Membrane
chemistry
Chemical engineering
Electrical resistivity and conductivity
visual_art
0103 physical sciences
Materials Chemistry
Ceramics and Composites
visual_art.visual_art_medium
Ionic conductivity
Ceramic
0210 nano-technology
Subjects
Details
- ISSN :
- 09552219
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Journal of the European Ceramic Society
- Accession number :
- edsair.doi...........7f38354cd2e3a73f4708eb9a91c3d24f