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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Auteurs principaux:	M. Tyunina, O. Pacherova, T. Kocourek, A. Dejneka
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2021
Sujets:	Medicine R Science Q
Accès en ligne:	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
_version_	1718383969795309568

Anisotropic chemical expansion due to oxygen vacancies in perovskite films

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