AI Article Synopsis
- Layered-type ordering and oxygen vacancy patterns are discovered in GdBaMnFeO(6-δ) perovskite, indicating changes in its crystal structure.
- Advanced imaging techniques confirm the arrangement of barium and gadolinium in distinct layers, revealing defects and the precise location of oxygen vacancies.
- The structural ordering significantly enhances the electrochemical properties of GdBaMnFeO(6-δ), making it a superior candidate for cathodes in solid oxide fuel cells compared to a more disordered version of the material.
Article Abstract
Layered-type ordering and oxygen vacancies ordering are revealed in GdBaMnFeO(6-δ) 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 GdBaMnFeO(6-δ) perovskite, are likely to be strongly affected by its ordering effects and crystal microstructure. In this sense, layered-type GdBaMnFeO(6-δ) perovskite show better electrochemical properties as cathodes in SOFCs than ion disordered Gd(0.5)Ba(0.5)Mn(0.5)Fe(0.5)O(3-δ) perovskite.
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| http://dx.doi.org/10.1039/c4dt03873h | DOI Listing |
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