TY - JOUR

T1 - Influence of different sintering techniques on microstructure and phase composition of oxygen-transporting ceramic

AU - Ravkina, Olga

AU - Räthel, Jan

AU - Feldhoff, Armin

N1 - Funding Information: The authors greatly acknowledge financial support from the Chinese-German Centre for Science ( GZ676 ) and the Deutsche Forschungsgemeinschaft ( FE 928/4-1 ) as well as fruitful discussions with Prof. Jürgen Caro. Publisher Copyright: © 2015 Elsevier Ltd.

PY - 2015/9/1

Y1 - 2015/9/1

N2 - The membrane microstructure and phase composition of Ruddlesden-Popper-type La2NiO4+δ ceramics, which were prepared by field-assisted sintering technique/spark plasma sintering (FAST/SPS) process or by conventional pressing and pressureless sintering were investigated. As starting material, a La2NiO4+δ powder, with an average particle size of 0.2μm was used. The grain-size distribution of the resulting membranes varied from 0.015μm2 for FAST/SPS sintered ceramic to 6.11μm2 for pressureless sintered membrane. The microstructure analysis of membranes was performed by transmission and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy and electron energy-loss spectroscopy. Phase transition from orthorhombic to tetragonal crystallographic structure in FAST/SPS material was investigated by temperature-dependent X-ray powder diffraction. The effect of sintering technique and grain size on the oxygen permeation performance of the membranes is discussed with respect to impurities in the material.

AB - The membrane microstructure and phase composition of Ruddlesden-Popper-type La2NiO4+δ ceramics, which were prepared by field-assisted sintering technique/spark plasma sintering (FAST/SPS) process or by conventional pressing and pressureless sintering were investigated. As starting material, a La2NiO4+δ powder, with an average particle size of 0.2μm was used. The grain-size distribution of the resulting membranes varied from 0.015μm2 for FAST/SPS sintered ceramic to 6.11μm2 for pressureless sintered membrane. The microstructure analysis of membranes was performed by transmission and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy and electron energy-loss spectroscopy. Phase transition from orthorhombic to tetragonal crystallographic structure in FAST/SPS material was investigated by temperature-dependent X-ray powder diffraction. The effect of sintering technique and grain size on the oxygen permeation performance of the membranes is discussed with respect to impurities in the material.

KW - Electron microscopy

KW - FAST/SPS sintering

KW - Microstructure

KW - Phase transition

KW - Ruddlesden-Popper phase

UR - http://www.scopus.com/inward/record.url?scp=84928826492&partnerID=8YFLogxK

U2 - 10.1016/j.jeurceramsoc.2015.03.039

DO - 10.1016/j.jeurceramsoc.2015.03.039

M3 - Article

AN - SCOPUS:84928826492

VL - 35

SP - 2833

EP - 2843

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

SN - 0955-2219

IS - 10

ER -