Cation disorder in Sr0.67Ba0.33Nb2O6 assessed by aberration corrected stem

L. López-Conesa; J.M. Rebled; A. Ruiz-Caridad; A. Torres-Pardo; M.L. Ruiz-González; J.M. González-Calbet; G. Dezanneau; S. Estradé; F. Peiró

Results in Materials (Oct 2019)

Cation disorder in Sr0.67Ba0.33Nb2O6 assessed by aberration corrected stem

L. López-Conesa,
J.M. Rebled,
A. Ruiz-Caridad,
A. Torres-Pardo,
M.L. Ruiz-González,
J.M. González-Calbet,
G. Dezanneau,
S. Estradé,
F. Peiró

Affiliations

L. López-Conesa: Laboratory of Electron Nanoscopy (LENS-MIND), Department of Electronic and Biomedical Engineering, University of Barcelona, C/ Martí i Franqués 1, Barcelona, 08028, Catalonia, Spain; Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028, Barcelona, Spain; Centres Científics i Tecnològics de La Universitat de Barcelona (CCiTUB), C/ Lluís Solé i Sabarís S/n, 08028, Barcelona, Spain; Corresponding author. Laboratory of Electron Nanoscopy (LENS-MIND), Department of Electronic and Biomedical Engineering, University of Barcelona, c/ Martí i Franqués 1, Barcelona, 08028, Catalonia, Spain.
J.M. Rebled: Laboratory of Electron Nanoscopy (LENS-MIND), Department of Electronic and Biomedical Engineering, University of Barcelona, C/ Martí i Franqués 1, Barcelona, 08028, Catalonia, Spain; Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028, Barcelona, Spain; Centres Científics i Tecnològics de La Universitat de Barcelona (CCiTUB), C/ Lluís Solé i Sabarís S/n, 08028, Barcelona, Spain
A. Ruiz-Caridad: Laboratory of Electron Nanoscopy (LENS-MIND), Department of Electronic and Biomedical Engineering, University of Barcelona, C/ Martí i Franqués 1, Barcelona, 08028, Catalonia, Spain; Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028, Barcelona, Spain; Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, C2N - Orsay, 91405, Orsay Cedex, France
A. Torres-Pardo: Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain
M.L. Ruiz-González: Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain
J.M. González-Calbet: Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain
G. Dezanneau: Laboratoire SPMS, Ecole Centrale Paris, Grande Voie des Vignes, 92295, Châtenay-Malabry Cedex, France
S. Estradé: Laboratory of Electron Nanoscopy (LENS-MIND), Department of Electronic and Biomedical Engineering, University of Barcelona, C/ Martí i Franqués 1, Barcelona, 08028, Catalonia, Spain; Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028, Barcelona, Spain
F. Peiró: Laboratory of Electron Nanoscopy (LENS-MIND), Department of Electronic and Biomedical Engineering, University of Barcelona, C/ Martí i Franqués 1, Barcelona, 08028, Catalonia, Spain; Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028, Barcelona, Spain

Journal volume & issue: Vol. 3
p. 100038

Abstract

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The microstructure and composition of a single crystal of the relaxor Sr0.67Ba0.33Nb2O6 have been assessed by aberration corrected TEM. Electron diffraction showed the presence of diffuse intensity and superstructure incommensurate reflections, compatible with Sr vacancies and Sr/Ba mixing at specific crystal sites respectively. Atomic resolution high angle annular dark field imaging confirmed the presence of these cation vacancies and electron energy loss spectroscopy demonstrated the random mixing of Ba and Sr. Unveiling structure and chemistry with this unprecedent spatial resolution gives the necessary understanding of the electric charge disorder at the origin of polar nanodomains, ultimately leading to relaxor behaviour.

Published in Results in Materials

ISSN: 2590-048X (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/results-in-materials

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