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Domain morphology of newly designed lead-free antiferroelectric NaNbO3-SrSnO3 ceramics

Ding, Hui ; Zhang, Mao-Hua ; Koruza, Jurij ; Molina-Luna, Leopoldo ; Kleebe, Hans-Joachim (2021):
Domain morphology of newly designed lead-free antiferroelectric NaNbO3-SrSnO3 ceramics.
In: Journal of the American Ceramic Society, 104 (7), pp. 3715-3725. ISSN 0002-7820,
DOI: 10.1111/jace.17738,
[Article]

Abstract

Reversible antiferroelectric-ferroelectric phase transitions were recently observed in a series of SrSnO3-modified NaNbO3 lead-free antiferroelectric materials, exhibiting well-defined double polarization hysteresis loops at ambient conditions. Here, transmission electron microscopy was employed to investigate the crystallographyand domain configuration of this newly designed system via electron diffraction and centered dark-field imaging. It was confirmed that antiferroelectricity is maintained in all compositions, manifested by the characteristic ¼ superlattice reflections in the electron-diffraction patterns. By investigating the antiferroelectric domains and domain boundaries in NaNbO3, we demonstrate that antiphase boundaries are present and their irregular periodicity is responsible for the streaking features along the ¼ superlattice reflections in the electron-diffraction patterns. The signature domain blocks observed in pure NaNbO3 are maintained in the SrSnO3-modified ceramics, but disappear when the amount of SrSnO3 reaches 7 mol.%. In particular, a well-defined and distinct domain configuration is observed in the NaNbO3 sample modified with 5 mol.% SrSnO3, which presents a parallelogram domain morphology.

Item Type: Article
Erschienen: 2021
Creators: Ding, Hui ; Zhang, Mao-Hua ; Koruza, Jurij ; Molina-Luna, Leopoldo ; Kleebe, Hans-Joachim
Title: Domain morphology of newly designed lead-free antiferroelectric NaNbO3-SrSnO3 ceramics
Language: English
Abstract:

Reversible antiferroelectric-ferroelectric phase transitions were recently observed in a series of SrSnO3-modified NaNbO3 lead-free antiferroelectric materials, exhibiting well-defined double polarization hysteresis loops at ambient conditions. Here, transmission electron microscopy was employed to investigate the crystallographyand domain configuration of this newly designed system via electron diffraction and centered dark-field imaging. It was confirmed that antiferroelectricity is maintained in all compositions, manifested by the characteristic ¼ superlattice reflections in the electron-diffraction patterns. By investigating the antiferroelectric domains and domain boundaries in NaNbO3, we demonstrate that antiphase boundaries are present and their irregular periodicity is responsible for the streaking features along the ¼ superlattice reflections in the electron-diffraction patterns. The signature domain blocks observed in pure NaNbO3 are maintained in the SrSnO3-modified ceramics, but disappear when the amount of SrSnO3 reaches 7 mol.%. In particular, a well-defined and distinct domain configuration is observed in the NaNbO3 sample modified with 5 mol.% SrSnO3, which presents a parallelogram domain morphology.

Journal or Publication Title: Journal of the American Ceramic Society
Journal volume: 104
Number: 7
Uncontrolled Keywords: TEM, lead-free antiferroelectrics, sodium niobate, domain morphology, antiphase boundary
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
LOEWE
LOEWE > LOEWE-Schwerpunkte
LOEWE > LOEWE-Schwerpunkte > FLAME - Fermi Level Engineering Antiferroelektrischer Materialien für Energiespeicher und Isolatoren
Date Deposited: 10 May 2021 06:14
DOI: 10.1111/jace.17738
Official URL: https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.17...
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