Revealing Strain Effects on the Chemical Composition of Perovskite Oxide Thin Films Surface, Bulk, and Interfaces
van den Bosch, Celeste A. M. (Imperial College. Department of Materials)
Cavallaro, Andrea ![Identificador ORCID](/img/uab/orcid.ico)
(Imperial College. Department of Materials)
Moreno, Roberto (Institut Català de Nanociència i Nanotecnologia)
Cibin, Giannantonio (Diamond Light Source Ltd.)
Kerherve, Gwilherm (Imperial College. Department of Materials)
Caicedo Roque, Jose Manuel ![Identificador ORCID](/img/uab/orcid.ico)
(Institut Català de Nanociència i Nanotecnologia)
Lippert, Thomas K. (ETH Zurich. Department of Chemistry and Applied Biosciences)
Doebeli, Max (ETH Zurich)
Santiso, José
(Institut Català de Nanociència i Nanotecnologia)
Skinner, Stephen J. (Imperial College. Department of Materials)
Aguadero, Ainara
(Imperial College. Department of Materials)
Data: |
2020 |
Resum: |
Understanding the effects of lattice strain on oxygen surface and diffusion kinetics in oxides is a controversial subject that is critical for developing efficient energy storage and conversion materials. In this work, high-quality epitaxial thin films of the model perovskite LaSrMnCoO (LSMC), under compressive or tensile strain, are characterized with a combination of in situ and ex situ bulk and surface-sensitive techniques. The results demonstrate a nonlinear correlation of mechanical and chemical properties as a function of the operation conditions. It is observed that the effect of strain on reducibility is dependent on the "effective strain" induced on the chemical bonds. In-plain strain, and in particular the relative BO length bond, is the key factor controlling which of the B-site cation can be reduced preferentially. Furthermore, the need to use a set of complimentary techniques to isolate different chemically induced strain effects is proven. With this, it is confirmed that tensile strain favors the stabilization of a more reduced lattice, accompanied by greater segregation of strontium secondary phases and a decrease of oxygen exchange kinetics on LSMC thin films. |
Drets: |
Tots els drets reservats. ![](/img/licenses/InC.ico) |
Llengua: |
Anglès |
Document: |
Article ; recerca ; Versió acceptada per publicar |
Matèria: |
Chemical expansion ;
Epitaxial thin films ;
In situ interfaces ;
Strain engineering |
Publicat a: |
Advanced materials interfaces, Vol. 7, Issue 2 (January 2020) , art. 1901440, ISSN 2196-7350 |
DOI: 10.1002/admi.201901440
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Registre creat el 2020-05-15, darrera modificació el 2022-09-10