Oxygen permeability of transition metal-containing La(Sr,Pr)Ga(Mg)O3-delta ceramic membranes
authors Yaremchenko, AA; Shaula, AL; Kharton, VV; Kovalevsky, AV; Naumovich, EN; Frade, JR; Marques, FBM
nationality International
journal BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
author keywords ceramic membrane; mixed conductor; perovskite; lanthanum gallate; oxygen permeability
keywords IONIC-CONDUCTIVITY; ELECTRONIC CONDUCTIVITY; DOPED LAGAO3; LACO(M)O-3 M; PEROVSKITES; TRANSPORT; FE; OXIDE; CR; NI
abstract Acceptor-type doping of perovskite-type La1-xSrxGa0.80-yMgyM0.20O3-delta (x = 0-0.20, y = 0.15-0.20, M = Fe, Co, Ni) leads to significant enhancement of ionic conductivity and oxygen permeability due to increasing oxygen vacancy concentration. The increase in strontium and magnesium content is accompanied, however, with increasing role of surface exchange kinetics as permeation-limiting factor. At temperatures below 1223 K, the oxygen permeation fluxes through La(Sr)Ga(Mg,M)O3-delta membranes with thickness less than 1.5 mm are predominantly limited by the exchange rates at membrane surface. The oxygen transport in transition metal-containing La(Sr)Ga(Mg)O3-delta ceramics increase in the sequence Co < Fe < Ni. The ionic conduction in these phases is, however, lower than that in the parent compounds, La1-xSrxGa1-yMgyO3-n. The highest level of oxygen permeation, comparable to that of La(Sr)Fe(CO)O-3- and La2NiO4-based phases, is observed for La0.90Sr0.10Ga0.65Mg0.15Ni0.20O3-delta membranes. The average thermal expansion coefficients of La(Sr)Ga (Mg,M)O3-delta ceramics in air are in range (11.6-18.4) x 10(-6) K-1 at 373-1273 K. Doping of LaGa0.65Mg0.15Ni0.20O3-delta with praseodymium results in moderate increase of the permeation fluxes, lower thermal expansion and an improved phase stability in reducing environments.
publisher SOCIEDAD ESPANOLA CERAMICA VIDRIO
issn 0366-3175
year published 2004
volume 43
issue 4
beginning page 769
ending page 774
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000223052500010
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journal analysis (jcr 2017):
journal impact factor 1.049
5 year journal impact factor 0.524
category normalized journal impact factor percentile 53.704
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