Strain-induced structure and oxygen transport interactions in epitaxial La 0.6 Sr 0.4 CoO 3− δ thin films
Ivanov, Yurii P.
Nature Publishing Group UK
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Ivanov, Y. P., Kubicek, M., Siebenhofer, M., Viernstein, A., Hutter, H., Fleig, J., Chuvilin, A., & et al. (2020). Strain-induced structure and oxygen transport interactions in epitaxial La 0.6 Sr 0.4 CoO 3− δ thin films. Communications Materials, 1 (1)https://doi.org/10.1038/s43246-020-0027-0
Abstract: The possibility to control oxygen transport in one of the most promising solid oxide fuel cell cathode materials, La0.6Sr0.4CoO3−δ, by controlling lattice strain raises questions regarding the contribution of atomic scale effects. Here, high-resolution transmission electron microscopy revealed the different atomic structures in La0.6Sr0.4CoO3−δ thin films grown under tensile and compressive strain conditions. The atomic structure of the tensile-strained film indicated significant local concentration of the oxygen vacancies, with the average value of the oxygen non-stoichiometry being much larger than for the compressive-strained film. In addition to the vacancy concentration differences that are measured by isotope exchange depth profiling, significant vacancy ordering was found in tensile-strained films. This understanding might be useful for tuning the atomic structure of La0.6Sr0.4CoO3−δ thin films to optimize cathode performance.
Article, /639/301/299/893, /639/301/357/53, article
External DOI: https://doi.org/10.1038/s43246-020-0027-0
This record's URL: https://www.repository.cam.ac.uk/handle/1810/316182