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Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials

The nature of the “forbidden” local- and long-range polar order in nominally non-polar paraelectric phases of ferroelectric materials has been an open question since the discovery of ferroelectricity in oxide perovskites, ABO(3). A currently considered model suggests locally correlated displacements...

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Autores principales: Bencan, Andreja, Oveisi, Emad, Hashemizadeh, Sina, Veerapandiyan, Vignaswaran K., Hoshina, Takuya, Rojac, Tadej, Deluca, Marco, Drazic, Goran, Damjanovic, Dragan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8175364/
https://www.ncbi.nlm.nih.gov/pubmed/34083529
http://dx.doi.org/10.1038/s41467-021-23600-3
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author Bencan, Andreja
Oveisi, Emad
Hashemizadeh, Sina
Veerapandiyan, Vignaswaran K.
Hoshina, Takuya
Rojac, Tadej
Deluca, Marco
Drazic, Goran
Damjanovic, Dragan
author_facet Bencan, Andreja
Oveisi, Emad
Hashemizadeh, Sina
Veerapandiyan, Vignaswaran K.
Hoshina, Takuya
Rojac, Tadej
Deluca, Marco
Drazic, Goran
Damjanovic, Dragan
author_sort Bencan, Andreja
collection PubMed
description The nature of the “forbidden” local- and long-range polar order in nominally non-polar paraelectric phases of ferroelectric materials has been an open question since the discovery of ferroelectricity in oxide perovskites, ABO(3). A currently considered model suggests locally correlated displacements of B-site atoms along a subset of <111> cubic directions. Such off-site displacements have been confirmed experimentally; however, being essentially dynamic in nature they cannot account for the static nature of the symmetry-forbidden polarization implied by the macroscopic experiments. Here, in an atomically resolved study by aberration-corrected scanning transmission electron microscopy complemented by Raman spectroscopy, we reveal, directly visualize and quantitatively describe static, 2–4 nm large polar nanoclusters in the nominally non-polar cubic phases of (Ba,Sr)TiO(3) and BaTiO(3). These results have implications on understanding of the atomic-scale structure of disordered materials, the origin of precursor states in ferroelectrics, and may help answering ambiguities on the dynamic-versus-static nature of nano-sized clusters.
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spelling pubmed-81753642021-06-09 Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials Bencan, Andreja Oveisi, Emad Hashemizadeh, Sina Veerapandiyan, Vignaswaran K. Hoshina, Takuya Rojac, Tadej Deluca, Marco Drazic, Goran Damjanovic, Dragan Nat Commun Article The nature of the “forbidden” local- and long-range polar order in nominally non-polar paraelectric phases of ferroelectric materials has been an open question since the discovery of ferroelectricity in oxide perovskites, ABO(3). A currently considered model suggests locally correlated displacements of B-site atoms along a subset of <111> cubic directions. Such off-site displacements have been confirmed experimentally; however, being essentially dynamic in nature they cannot account for the static nature of the symmetry-forbidden polarization implied by the macroscopic experiments. Here, in an atomically resolved study by aberration-corrected scanning transmission electron microscopy complemented by Raman spectroscopy, we reveal, directly visualize and quantitatively describe static, 2–4 nm large polar nanoclusters in the nominally non-polar cubic phases of (Ba,Sr)TiO(3) and BaTiO(3). These results have implications on understanding of the atomic-scale structure of disordered materials, the origin of precursor states in ferroelectrics, and may help answering ambiguities on the dynamic-versus-static nature of nano-sized clusters. Nature Publishing Group UK 2021-06-09 /pmc/articles/PMC8175364/ /pubmed/34083529 http://dx.doi.org/10.1038/s41467-021-23600-3 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Bencan, Andreja
Oveisi, Emad
Hashemizadeh, Sina
Veerapandiyan, Vignaswaran K.
Hoshina, Takuya
Rojac, Tadej
Deluca, Marco
Drazic, Goran
Damjanovic, Dragan
Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials
title Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials
title_full Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials
title_fullStr Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials
title_full_unstemmed Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials
title_short Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials
title_sort atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8175364/
https://www.ncbi.nlm.nih.gov/pubmed/34083529
http://dx.doi.org/10.1038/s41467-021-23600-3
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