New insights into the GdBaCo2O5+delta material: Crystal structure, electrical and electrochemical properties
authors Munoz-Gil, D; Perez-Coll, D; Pena-Martinez, J; Garcia-Martin, S
nationality International
journal JOURNAL OF POWER SOURCES
author keywords Intermediate temperature solid oxide fuel cells; GBCO; Perovskite structure; Electrical properties
keywords PHASE-TRANSITION; OXYGEN REDUCTION; IT-SOFCS; PEROVSKITE; CATHODE
abstract Selected area electron diffraction (SAED) and high resolution transmission electron microscopy (HRTEM) studies reveal that the crystal structure and microstructure of GdBaCo2O5+delta are highly influenced by the oxygen stoichiometry. In addition to layered-type ordering of the Ba and Gd atoms along the c-direction of the structure and location of anion vacancies within the (GdO)x planes giving a a(p) x a(p) x 2a(p) unit cell, two different perovskite related superstructures are observed. A superstructure with a(p) x 3a(p) x 2a(p) unit cell, probably due to extra ordering of the anion vacancies within the (GdO)(x) planes is formed for 6 values close to 033 and a superstructure with root 2a(p) x root 2b(p) x 2a(p) unit cell associated to tilting of the CoO6 octahedra appears for the compound with 6 values close to 1. Domain formation with perpendicular orientations of the unit cell occurs in crystals with orthorhombic symmetry of the structure. Physical properties of the aforementioned material, which is well known as a potential candidate of cathode for intermediate temperature solid oxide fuel cells, are likely to be strongly affected by its oxygen stoichiometry and therefore by its crystal structure and microstructure. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0378-7753
year published 2014
volume 263
beginning page 90
ending page 97
digital object identifier (doi) 10.1016/j.jpowsour.2014.04.019
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary
subject category Chemistry; Electrochemistry; Energy & Fuels; Materials Science
unique article identifier WOS:000337857500013
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journal impact factor 6.945
5 year journal impact factor 6.686
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