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research article

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

Bencan, Andreja
•
Oveisi, Emad  
•
Hashemi Zadeh, Sina  
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2021
Nature Communications

The nature of the "forbidden" local- and long-range polar order in nominally nonpolar paraelectric phases of ferroelectric materials has been an open question since the discovery of ferroelectricity in oxide perovskites (ABO3). A currently considered model suggests locally correlated displacements of B-site atoms along a subset of <111> cubic directions. Such offsite 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 (STEM) complemented by Raman spectroscopy, we reveal, directly visualize and quantitatively describe static, 2-4 nm large polar nanoclusters in the nominally nonpolar cubic phases of (Ba,Sr)TiO3 and BaTiO3. 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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Type
research article
DOI
10.1038/s41467-021-23600-3
ArXiv ID

2010.10860

Author(s)
Bencan, Andreja
Oveisi, Emad  
Hashemi Zadeh, Sina  
Veerapandiyan, Vignaswaran K.
Hoshina, Takuya
Rojac, Tadej
Deluca, Marco
Drazic, Goran
Damjanovic, Dragan  
Date Issued

2021

Publisher

Nature Research

Published in
Nature Communications
Volume

12

Issue

1

Article Number

3509

Note

This is an Open Access article under the terms of the Creative Commons Attribution License

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SCI-STI-DD  
Available on Infoscience
October 25, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/172752
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