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