0567894 - FZÚ 2023 RIV GB eng J - Journal Article
Tyunina, Marina - Levoska, J. - Pacherová, Oliva - Kocourek, Tomáš - Dejneka, Alexandr
Strain enhancement due to oxygen vacancies in perovskite oxide films.
Journal of Materials Chemistry C. Roč. 10, č. 17 (2022), s. 6770-6777. ISSN 2050-7526. E-ISSN 2050-7534
R&D Projects: GA ČR(CZ) GA22-10832S; GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : strain enhancemen * oxygen vacancies * perovskite oxide films
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.4, year: 2022 ; AIS: 1.166, rok: 2022
Method of publishing: Open access
DOI: https://doi.org/10.1039/d1tc04969k

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.
Permanent Link: https://hdl.handle.net/11104/0339146