Anisotropic chemical expansion due to oxygen vacancies in perovskite films

Abstract In scientifically intriguing and technologically important multifunctional ABO3 perovskite oxides, oxygen vacancies are most common defects. They cause lattice expansion and can alter the key functional properties. Here, it is demonstrated that contrary to weak isotropic expansion in bulk s...

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Autores principales: M. Tyunina, O. Pacherova, T. Kocourek, A. Dejneka
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Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/f5939ac55e94426e8c04f77865a8d2ef
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spelling oai:doaj.org-article:f5939ac55e94426e8c04f77865a8d2ef2021-12-02T16:30:10ZAnisotropic chemical expansion due to oxygen vacancies in perovskite films10.1038/s41598-021-93968-12045-2322https://doaj.org/article/f5939ac55e94426e8c04f77865a8d2ef2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93968-1https://doaj.org/toc/2045-2322Abstract In scientifically intriguing and technologically important multifunctional ABO3 perovskite oxides, oxygen vacancies are most common defects. They cause lattice expansion and can alter the key functional properties. Here, it is demonstrated that contrary to weak isotropic expansion in bulk samples, oxygen vacancies produce strong anisotropic strain in epitaxial thin films. This anisotropic chemical strain is explained by preferential orientation of elastic dipoles of the vacancies. Elastic interaction of the dipoles with substrate-imposed misfit strain is suggested to define the dipolar orientation. Such elastic behavior of oxygen vacancies is anticipated to be general for perovskite films and have critical impacts on the film synthesis and response functions.M. TyuninaO. PacherovaT. KocourekA. DejnekaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-6 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
M. Tyunina
O. Pacherova
T. Kocourek
A. Dejneka
Anisotropic chemical expansion due to oxygen vacancies in perovskite films
description Abstract In scientifically intriguing and technologically important multifunctional ABO3 perovskite oxides, oxygen vacancies are most common defects. They cause lattice expansion and can alter the key functional properties. Here, it is demonstrated that contrary to weak isotropic expansion in bulk samples, oxygen vacancies produce strong anisotropic strain in epitaxial thin films. This anisotropic chemical strain is explained by preferential orientation of elastic dipoles of the vacancies. Elastic interaction of the dipoles with substrate-imposed misfit strain is suggested to define the dipolar orientation. Such elastic behavior of oxygen vacancies is anticipated to be general for perovskite films and have critical impacts on the film synthesis and response functions.
format article
author M. Tyunina
O. Pacherova
T. Kocourek
A. Dejneka
author_facet M. Tyunina
O. Pacherova
T. Kocourek
A. Dejneka
author_sort M. Tyunina
title Anisotropic chemical expansion due to oxygen vacancies in perovskite films
title_short Anisotropic chemical expansion due to oxygen vacancies in perovskite films
title_full Anisotropic chemical expansion due to oxygen vacancies in perovskite films
title_fullStr Anisotropic chemical expansion due to oxygen vacancies in perovskite films
title_full_unstemmed Anisotropic chemical expansion due to oxygen vacancies in perovskite films
title_sort anisotropic chemical expansion due to oxygen vacancies in perovskite films
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/f5939ac55e94426e8c04f77865a8d2ef
work_keys_str_mv AT mtyunina anisotropicchemicalexpansionduetooxygenvacanciesinperovskitefilms
AT opacherova anisotropicchemicalexpansionduetooxygenvacanciesinperovskitefilms
AT tkocourek anisotropicchemicalexpansionduetooxygenvacanciesinperovskitefilms
AT adejneka anisotropicchemicalexpansionduetooxygenvacanciesinperovskitefilms
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