Journal
CHEMISTRY OF MATERIALS
Volume 24, Issue 10, Pages 1910-1916Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm300655y
Keywords
oxygen-storage material; nudged elastic band; DFT; oxygen hopping pathways; ab initio thermochemistry; BaYMn2O6
Funding
- RWTH
- Japan Society for the Promotion of Science [22750181]
- Grants-in-Aid for Scientific Research [22750181] Funding Source: KAKEN
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The experimentally known perovskite-like materials BaYMn2O5+delta (delta = 0, 0.5, 1) are characterized by a remarkably reversible oxygen-storage capacity at a moderate 500 degrees C. We try to elucidate the local structures of the vacancy arrangements in these compounds taking place after an oxygen release. This is done for the three compounds with the help of both ab initio total-energy calculations of density-functional quality and using classical structure rationale. Our results are compared with experimental structure findings. We further calculate oxygen-vacancy formation energies and predict the pathways of the oxygen atoms through the crystal by using NEB (nudged elastic band) calculations. Structure diagrams of the most likely energy pathways for oxygen migration are presented. Finally, thermodynamic considerations of the oxygen intake are carried out based on quasiharmonic phonon calculations and compared with experimental data. The theoretical molar reaction enthalpy for oxidizing BaYMn2O5 to BaYMn2O6 matches the experimental value.
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