Ordering effects in the crystal structure and electrochemical properties of the Gd0.5Ba0.5Mn0.5Fe0.5O3-delta perovskite
authors Munoz-Gil, D; Avila-Brande, D; Urones-Garrote, E; Garcia-Martin, S
nationality International
journal DALTON TRANSACTIONS
keywords OXIDE FUEL-CELLS; FAST OXYGEN DIFFUSION; CATHODES; PRBACO2O5+DELTA
abstract Layered-type ordering and oxygen vacancies ordering are revealed in GdBaMnFeO6-delta perovskite. Selected area electron diffraction and high-resolution transmission electron microscopy results indicate a modulation of the crystal structure. Ba and Gd ordering in (001)(p) layers is confirmed by high angle annular dark field scanning transmission electron microscopy and electron energy-loss spectroscopy. These techniques also revealed formation of layer-stacking defects in the crystals. Direct imaging of the oxygen sublattice is obtained by phase image reconstruction. Location of the oxygen vacancies in the (GdO)(x) layers is achieved by analysis of the intensity of the averaged phase image. Physical properties of the GdBaMnFeO6-delta perovskite, are likely to be strongly affected by its ordering effects and crystal microstructure. In this sense, layered-type GdBaMnFeO6-delta perovskite show better electrochemical properties as cathodes in SOFCs than ion disordered Gd0.5Ba0.5Mn0.5Fe0.5O3-delta perovskite.
publisher ROYAL SOC CHEMISTRY
issn 1477-9226
year published 2015
volume 44
issue 23
beginning page 10867
ending page 10874
digital object identifier (doi) 10.1039/c4dt03873h
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000355701000038
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