Ruddlesden-Popper-type Nd2-xNi1-yCuyO4±δ layered oxides as candidate materials for MIEC-type ceramic membranes
作者： Bartłomiej Gędziorowski , Kacper Cichy , Anna Niemczyk , Anna Olszewska , Zijia Zhang
DOI: 10.1016/J.JEURCERAMSOC.2020.04.054
关键词: Oxygen 、 Ionic conductivity 、 Materials science 、 Crystal structure 、 Electrical resistivity and conductivity 、 Membrane 、 Ceramic 、 Chemical engineering 、 Oxygen permeability 、 Microstructure
摘要: 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 solid state solution, crystal structure, oxygen content, as well regarding transport properties permeability when applied mixed conducting ceramic membranes. The A-site deficiency x discussed in terms structural stability its effect on the with ongoing modification total electrical conductivity observed. In selected Nd2-xNi0.75Cu0.25O4±δ dominating defects at high temperatures can be changed from interstitials to vacancies induced deficiency, which affects bulk- surface-related coefficients, it observed relaxation studies. optimized Nd1.9Ni0.75Cu0.25O4±δ sinters having increased ionic conductivity, fine, well-sintered microstructure allow achieve one higher reported fluxes for CO2-stable Ruddlesden-Popper-based membranes (e.g. 0.49 mL cm−2 min−1 ca. 880 °C 1.05 mm thickness).
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