University of Oulu

Tyunina, M., Levoska, J., Pacherova, O., Kocourek, T., & Dejneka, A. (2022). Strain enhancement due to oxygen vacancies in perovskite oxide films. Journal of Materials Chemistry C, 10(17), 6770–6777.

Strain enhancement due to oxygen vacancies in perovskite oxide films

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Author: Tjunina, Marina1,2; Levoska, Juhani1; Pacherova, O.2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90014 Oulu, Finland
2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.8 MB)
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Language: English
Published: Royal Society of Chemistry, 2022
Publish Date: 2022-10-27


Control of lattice strain in epitaxial films of ABO3 perovskite oxides is crucial for modern understanding and applications of these scientifically and technologically important materials. Here, we show that oxygen vacancies have unique impacts on lattice strain in such films. We suggest that in the presence of substrate-imposed misfit in epitaxial or highly oriented films, the crystallographic alignment of anisotropic elastic dipole tensors of oxygen vacancies is energetically favorable. The dipolar alignment leads to an enhanced above-misfit magnitude of maximal lattice strain and to increased inhomogeneous strain or strain gradients. The vacancy-induced remarkably strong elastic effects are experimentally validated by varying the misfit strain and oxygen content in thin films of perovskite niobate (ANbO3) and titanate (ATiO3) ferroelectrics. It is anticipated that elastic effects of oxygen vacancies are relevant for controlling strain in epitaxial films of a broad range of functional oxides.

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Series: Journal of materials chemistry. C, Materials with applications in optical, magnetic & electronic devices
ISSN: 2050-7526
ISSN-E: 2050-7534
ISSN-L: 2050-7526
Volume: 10
Issue: 17
Pages: 6770 - 6777
DOI: 10.1039/d1tc04969k
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
114 Physical sciences
Funding: The authors acknowledge support from the European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOLID21 – CZ.02.1.01/0.0/0.0/16_019/0000760) and the Czech Science Foundation (Grant No. 22-10832S).
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Copyright information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.