Oxygen ion migration in perovskite-type oxides
Journal Article
·
· Journal of Solid State Chemistry
- Univ. of Surrey, Guildford (United Kingdom)
- Royal Institution, London (United Kingdom)
Computer simulation techniques have been applied to pervoskite-structured LaBO{sub 3} (where B = Cr, Mn, Fe, Co) in order to elucidate the mechanistic features of energetics of oxygen ion migration. For the four compounds considered, a common set of interatomic potentials was derived that correctly reproduces their observed cubic structures. The results support models in which diffusion is mediated by oxygen ion vacancies. Analysis of the potential energy surface demonstrates that vacancy migration takes place along the anion octahedron edge, although not in a linear fashion but via a curved path. The calculated migration energies vary from 0.5 to 0.9 eV and are in accord with the available experimental values. The authors consider the relationship between the cation size and the migration energy, which was investigated by modifying the interatomic potential function to relate ionic radii directly to the short-range repulsive term. The authors also examine the energies of solution for alkaline-earth dopants on the La site with oxygen vacancy compensation. Ion size effects are found to be important, with Sr calculated to have the highest solubility. Finally, the authors investigate the formation of dopant-vacancy pair clusters.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 146455
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 118; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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