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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

nveiling Center-Type Topological Defects on Rosettes of Lead Zirconate Titanate Associated to Oxygen Vacancie

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Neckel, Itamar T. [1] ; da Silva, Francisco M. C. [1] ; Guedes, Eduardo B. [2] ; Dias, Carlos S. B. [1] ; Soares, Marcio M. [3] ; Costa, Carlos A. R. [4] ; Mori, Thiago J. A. [1] ; Bjorling, Alexander [5] ; Zakharov, Alexei [5] ; Tolentino, Helio C. N. [1]
Total Authors: 10
[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[2] Paul Scherrer Inst, Photon Sci Div, CH-5232 Villigen - Switzerland
[3] Univ Fed Paraiba, Dept Fis, BR-58051970 Joao Pessoa, Paraiba - Brazil
[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil
[5] Lund Univ, MAX IV Lab, S-22484 Lund - Sweden
Total Affiliations: 5
Document type: Journal article
Source: Annalen der Physik; v. 534, n. 2 DEC 2021.
Web of Science Citations: 0

Understanding the formation of topological defects in ferroelectric materials can provide access to their unusual physics, invaluable for possible applications of domain engineering in nanoelectronics. The present study shows the spontaneous formation of center-type topological defects in lead zirconate titanate (PZT) films, characterized by a strong in-plane radial electromechanical response on rosette-like structures, as revealed by piezoelectric response force microscopy. Multi-modal electron and X-ray based techniques provide a comprehensive set of tools for delving at atomic scale the local chemistry, electronic, and crystalline structures. The elemental surface-sensitivity of soft X-ray absorption shows chemical segregation and drastic changes in the titanium electronic structure, which have been associated to oxygen vacancies, leading to a mechanism that describe the polarization symmetry on the rosettes. X-ray nanofluorescence experiments revealed titanium segregation, corroborating with the absorption and low energy electron microscopy images. Taking advantage of a nanobeam, 2D nanodiffraction maps probed the complex microstructure of the domains, revealing its mosaicity and lattice strain at the nanoscale. This study highlights a complex topological structure and provides, by the simultaneous application of a set of analytical tools, a broad comprehension of the formation of center-type ferroelectric topological defects in PZT. (AU)

FAPESP's process: 19/17633-2 - Code development and data treatment for coherent diffractive Imaging experiments in Bragg condition: Bragg coherent diffractive Imaging methodological studies
Grantee:Francisco Mateus Cirilo da Silva
Support type: Scholarships abroad - Research Internship - Master's degree