Oxygen-ionic conductivity of perovskite-type La1-xSrxGa1-yMgyM0.20O3-delta (M = Fe, Co, Ni)
authors Yaremchenko, AA; Shaula, AL; Logvinovich, DI; Kharton, VV; Kovalevsky, A; Naumovich, EN; Frade, JR; Marques, FMB
nationality International
journal MATERIALS CHEMISTRY AND PHYSICS
author keywords ceramics; electrochemical techniques; electrical conductivity; diffusion
keywords OXIDE FUEL-CELLS; LANTHANUM GALLATE; DOPED LAGAO3; ELECTRICAL-PROPERTIES; LACO(M)O-3 M; ELECTROLYTE; TRANSPORT; CR; TEMPERATURE; MAGNESIUM
abstract The oxygen-ionic conductivity of perovskite-type La1-xSrxGa0.80-yMgyM0.2O3-delta (x = 0-0.20, y = 0.15-0.20, M = Fe, Co, Ni) and La0.50Pr0.50Ga0.65Mg0.15Ni0.2O3-delta in air, determined by the measurements of total conductivity, faradaic efficiency and oxygen permeability at 973-1223 K, increases with increasing concentration of the acceptor-type dopants, within the solid solution formation limits. The level of ionic conduction in these phases is, however, lower than that in parent compounds, La1-xSrxGa1-yMgyO3-delta, probably due to partial oxygen-vacancy ordering and a higher average cation-anion bond energy in transition metal-containing gallates. The activation energy for ionic transport in La1-xSrxGa0.80-gammaMgyM0.20O3-delta varies in the range of 126-171 kJ mol(-1). For compositions containing different transition metal cations, the ionic transport increases in the sequence M = Co < Fe < Ni, with the maximum ionic conductivity observed for La0.90Sr0.10Ga0.65Mg0.15Ni0.20O3-delta perovskite. (C) 2003 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0254-0584
year published 2003
volume 82
issue 3
beginning page 684
ending page 690
digital object identifier (doi) 10.1016/S0254-0584(03)00329-8
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000187239300031
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