Strain enhancement due to oxygen vacancies in perovskite oxide films

0567894 - FZÚ 2023 RIV GB eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR(CZ) GA22-10832S; GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: strain enhancemen * oxygen vacancies * perovskite oxide films
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 6.4, rok: 2022
Způsob publikování: Open access

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.
Trvalý link: https://hdl.handle.net/11104/0339146