Ion transport in dual-phase SrFe1-xD cent D degrees O-x(3-delta) (x=0.03-aEuro parts per thousand 0.10): effects of redox cycling
authors Shalaeva, EV; Patrakeev, MV; Markov, AA; Tyutyunnik, AP; Murzakaev, AM; Kharton, VV; Tsipis, EV; Waerenborgh, JC; Leonidov, IA; Kozhevnikov, VL
nationality International
journal JOURNAL OF SOLID STATE ELECTROCHEMISTRY
author keywords Mixed conductors; Ta-substituted strontium ferrite; Nanodomain structure; Perovskite-brownmillerite composite; Oxygen ion conductivity; Redox behavior
keywords CALCIUM LANTHANUM FERRITES; MIXED CONDUCTIVITY; TEMPERATURE; CAXLA1-XFEO3-Y
abstract The incorporation of tantalum cations in mixed-conducting SrFe1-xTaxO3-delta (x = 0.03 -aEuro parts per thousand 0.10) results in the formation of single cubic perovskite-like phases in oxidizing atmospheres while under reducing conditions phase separation is observed, accompanied with an appearance of brownmillerite-type nanodomains on the background of the perovskite-like matrix. For SrFe0.97Ta0.03O3-delta after reduction, the x-ray and electron diffraction studies combined with transmission electron microscopy evidence the formation of approximately 30 vol.% brownmillerite phase with an average domain size of 20-40 nm. The oxygen partial pressure dependencies of the total conductivity in the range from 10(-20) to 0.5 atm at 700-950 A degrees C show that the electron transport parameters remain virtually independent on the dopant content and domain structure. Contrary to the materials with higher dopant content, however, the ion conduction in SrFe0.97Ta0.03O3-delta tends to substantially increase on redox cycling. This behavior was attributed to the brownmillerite domain disintegration and rearrangement, induced by cyclic formation and disappearance of oxygen vacancies.
publisher SPRINGER
issn 1432-8488
year published 2015
volume 19
issue 3
beginning page 841
ending page 849
digital object identifier (doi) 10.1007/s10008-014-2698-2
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000350481600023
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