Anisotropic chemical expansion due to oxygen vacancies in perovskite films
| Autor: | Tomáš Kocourek, M. Tyunina, O. Pacherova, A. Dejneka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Electronic properties and materials Science chemistry.chemical_element 02 engineering and technology 01 natural sciences Oxygen Article Condensed Matter::Materials Science Surfaces interfaces and thin films Bulk samples 0103 physical sciences 010306 general physics Misfit strain Anisotropy Perovskite (structure) Multidisciplinary Condensed matter physics Isotropy 021001 nanoscience & nanotechnology Anisotropic strain Dipole chemistry Medicine 0210 nano-technology |
| Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-6 (2021) Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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