authors |
Kharton, VV; Shaula, AL; Snijkers, FMM; Cooymans, JFC; Luyten, JJ; Marozau, IP; Viskup, AP; Marques, FMB; Frade, JR |
nationality |
International |
journal |
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY |
author keywords |
perovskites; sintering; ionic conductivity; membranes; Sr(Fe, Al)O(3); (La, Sr)(Fe,Ga)O(3) |
keywords |
ION-TRANSPORT; METHANE OXIDATION; THERMAL-EXPANSION; CONDUCTIVITY; PEROVSKITES; STABILITY; BEHAVIOR; PHASE; CERIA; GAS |
abstract |
Moderate additions of Al(2)O(3) to strontium ferrite-based mixed conductors, such as SrFe(0.7)Al(0.3)O(3-delta) and La(0.2)Sr(0.8)Fe(0.8)Ga(0.2)O(3-delta) with the composition close to the solid solution formation limits, make it possible to improve ceramics sinterability, to increase oxygen permeability and to decrease thermal expansion. These effects are associated with the segregation of alumina-rich phases, primarily SrAl(2)O(4), and the formation of A-site cation-deficient perovskite. The improved properties of the SrFe(0.7)Al(0.3)O(3)-based material were used to fabricate high-quality tubular membranes for methane conversion reactors. Similar enhancement in sinterability is also observed for another promising parent material of mixed-conducting membranes, La(0.5)Sr(0.5)FeO(3-delta). However, extensive dissolution of Al(3+), cations in the iron sublattice, creation of A-site vacancies and changing the La:Sr concentration ratio all lead to decreasing ionic transport in La(0.5)Sr(0.5)FeO(3-delta). As a result, additions of either Al(2)O(3) or SrAlO(4) have a deteriorating influence on the oxygen permeation fluxes through La(0.5)Sr(0.5)FeO(3)-based ceramics. (c) 2005 Elsevier Ltd. All rights reserved. |
publisher |
ELSEVIER SCI LTD |
issn |
0955-2219 |
year published |
2006 |
volume |
26 |
issue |
16 |
beginning page |
3695 |
ending page |
3704 |
digital object identifier (doi) |
10.1016/j.jeurceramsoc.2005.10.013 |
web of science category |
Materials Science, Ceramics |
subject category |
Materials Science |
unique article identifier |
WOS:000241841300025
|
ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
4.495 |
5 year journal impact factor |
4.283 |
category normalized journal impact factor percentile |
98.214 |
dimensions (citation analysis):
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altmetrics (social interaction):
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