期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 7, 页码 2183-2186出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm02924f
关键词
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资金
- Spanish Ministry of Science and Innovation [CDS-2009-00050]
- Generalitat de Catalunya'' (Advanced Materials for Energy Network, XaRMAE) [2009-SGR-440]
- [EP/F009720/1]
We use molecular dynamics in conjunction with an established set of Born model potentials to examine the oxygen ion diffusion mechanism in the double perovskite GdBaCo2O5+delta. We predict that the mechanism of oxygen diffusion is highly anisotropic diffusion occurring only in the Gd-O and adjacent Co-O layers. For GdBaCo2O5.5 the activation energy of oxygen diffusion is 0.5 eV. We investigate the effect that cation disorder of the Gd-Ba sublattice has upon the diffusivity, the anisotropy and the diffusion mechanism in GdBaCo2O5+delta, which is a model system for double perovskites and other layered compounds. Cation disorder results in a reduction of the oxygen diffusivity and the appearance of diffusion along the c-axis of the material. Oxygen diffusion becomes effectively isotropic when the cation sublattice is disordered.
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