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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Azevedo, Nuno Monteiro |
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Zhang, Mao Hua
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Publications (6/6 displayed)
- 2024Heterogeneous Antiferroelectric Ordering in NaNbO3-SrSnO3 Ceramics Revealed by Direct Superstructure Imaging
- 2024Coupled local residual shear and compressive strain in NaNbO3 ceramics under coolingcitations
- 2022Revealing the solid-state processing mechanisms of antiferroelectric AgNbO3 for energy storagecitations
- 2021Domain morphology of newly designed lead-free antiferroelectric NaNbO3-SrSnO3 ceramicscitations
- 2021Polarization Rotation at Morphotropic Phase Boundary in New Lead-Free Na1/2Bi1/2V1-xTi xO3 Piezoceramicscitations
- 2020Electric-field-induced antiferroelectric to ferroelectric phase transition in polycrystalline NaNbO3citations
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article
Domain morphology of newly designed lead-free antiferroelectric NaNbO3-SrSnO3 ceramics
Abstract
<p>Reversible antiferroelectric-ferroelectric phase transitions were recently observed in a series of SrSnO<sub>3</sub>-modified NaNbO<sub>3</sub> lead-free antiferroelectric materials, exhibiting well-defined double polarization hysteresis loops at ambient conditions. Here, transmission electron microscopy was employed to investigate the crystallography and 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 NaNbO<sub>3</sub>, 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 NaNbO<sub>3</sub> are maintained in the SrSnO<sub>3</sub>-modified ceramics, but disappear when the amount of SrSnO<sub>3</sub> reaches 7 mol.%. In particular, a well-defined and distinct domain configuration is observed in the NaNbO<sub>3</sub> sample modified with 5 mol.% SrSnO<sub>3</sub>, which presents a parallelogram domain morphology.</p>