Quantification and mapping of elastic strains in ferroelectric [BaZrO3]xᴧ/[BaTiO3](1-x)ᴧ superlattices
| Autor: | Houssny Bouyanfif, Mustapha Jouiad, Florent Ravaux, M. El Marssi, J. Belhadi |
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| Přispěvatelé: | Laboratoire de Physique de la Matière Condensée - UR UPJV 2081 (LPMC), Université de Picardie Jules Verne (UPJV) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Diffraction
[PHYS]Physics [physics] Materials science Superlattice General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Epitaxy 01 natural sciences Ferroelectricity Atomic units Molecular physics 0104 chemical sciences Surfaces Coatings and Films Pulsed laser deposition Electron diffraction Scanning transmission electron microscopy 0210 nano-technology |
| Zdroj: | Applied Surface Science Applied Surface Science, Elsevier, 2020, 512, pp.145761-. ⟨10.1016/j.apsusc.2020.145761⟩ |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2020.145761⟩ |
| Popis: | We report on quantification and elastic strain mapping in two artificial [BaZrO3]xᴧ/[BaTiO3](1-x)ᴧ (BZxᴧ/BT(1-x)ᴧ) superlattices having periods of Λ = 6.6 nm and Λ = 11 nm respectively, grown on (0 0 1) SrTiO3 single crystal substrate by pulsed laser deposition technique. The methodology consists of a combination of high-resolution scanning transmission electron microscopy and nanobeam electron diffraction associated with dedicated algorithm for diffraction patterns processing originally developed for semiconductors to record the strains at atomic scale. Both in-plane and out-of-plane elastic strains were then determined at 2 nm spatial resolution and their average values were used to map the strains along and transverse to the epitaxial growth direction of both samples to determine its variation along several BZ/BT interfaces. In addition, the variation of the width of the inter-diffusion BT/BZ interfaces and intermixing between different layers are estimated. The obtained width average value measured in these inter-diffusion interfaces vary from 8 to 12% and from 9 to 11% for both superlattices having Λ = 6.6 nm and Λ = 11 nm respectively. These inter-diffusion interfaces and the inherent elastic strains due to the confined layers of the superlattices are known to be the most important parameters, responsible of the change in their functional properties. |
| Databáze: | OpenAIRE |
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