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Strain-induced structure and oxygen transport interactions in epitaxial La 0.6 Sr 0.4 CoO 3− δ thin films

Published version
Peer-reviewed

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Authors

Ivanov, Yurii P. 
Kubicek, Markus 
Siebenhofer, Matthäus  ORCID logo  https://orcid.org/0000-0002-6450-0261
Viernstein, Alexander 
Hutter, Herbert 

Abstract

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.

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Keywords

Article, /639/301/299/893, /639/301/357/53, article

Journal Title

Communications Materials

Conference Name

Journal ISSN

2662-4443

Volume Title

1

Publisher

Nature Publishing Group UK