Phase interaction and oxygen transport in oxide composite materials
authors Shaula, AL; Kharton, VV; Marques, FMB; Kovalevsky, AV; Viskup, AP; Naumovich, EN
nationality International
journal BRITISH CERAMIC TRANSACTIONS
author keywords ionic conductivity; mixed conduction; oxide composites; oxygen permeation; phase interaction
keywords SEPARATION MEMBRANES; CONDUCTIVITY; CERIA; CONDUCTORS
abstract The oxygen permeability of oxide composite membranes containing similar volume fractions of the components, including (La0.9Sr0.1)(0.98)Ga0.8Mg0.2O3-delta (LSGM)-La0.8Sr0.2Fe0.8Co0.2O3-delta (LSFC), LSGM-La2Ni0.8Cu0.2O4+delta (LNC), SrCoO3-delta-Sr2Fe3O6.5+/-delta, Ce0.8Gd0.2O2-delta (CGO)-LSFC and CGO-La0.7Sr0.3MnO3-delta (LSM), was studied at 973-1223 K. In most cases, oxygen transport is substantially affected by component interaction, decreasing ionic conductivity due to cation interdiffusion, and formation of intermediate phases and/or blocking layers at grain boundaries. This interaction is maximised in systems where the phase components have similar structure and thus may form continuous solid solutions, for example LSGM-LSFC, or intermediate compounds such as Roddlesden-Popper phases in LSGM-LNC composites. The results show that, in addition to knowledge of the transport properties and volume fractions of percolating phases, analysis of ionic conduction in oxide composite materials requires assessment of phase interaction and grain boundary processes.
publisher MANEY PUBLISHING
issn 0967-9782
year published 2004
volume 103
issue 5
beginning page 211
ending page 218
digital object identifier (doi) 10.1179/096797804225018633
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000225196200004
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