Nanoscale polar regions embedded within ferroelectric domains in 
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Fetzer, Ann‐Katrin; Wohninsland, Andreas; Venkataraman, Lalitha Kodumudi; Kleebe, Hans‐Joachim

doi:10.1103/physrevmaterials.6.064409

Cited by 5 publications

(3 citation statements)

References 47 publications

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“…The obtained 180° phase difference of all these domains is consistent with ferroelectric domains with different polarization orientations (see Figure S16 for more results) . Furthermore, bright-field imaging mode STEM was utilized to visualize the ferroelectric domain. − As illustrated in Figure e and Figure S17, the domain structure of the same length scale was identified in electron-phase-contrast bright-field imaging, and the morphology of the domain correlates well with the domain pattern probed by in-plane PFM. The larger grid-like domains (100 nm width macrostripes) in Figure g are made of smaller nanostripes (10 nm width) oriented at 120° with respect to the long axis of the macrostripes, and these nanostripes are arranged in an antiparallel fashion, similar to what was probed by STEM in Figure .…”

Section: Resultsmentioning

confidence: 73%

In-Plane Ferrielectric Order in van der Waals β′-In₂Se₃

Wang,

Zhou,

et al. 2023

ACS Nano

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van der Waals ferroic materials exhibit rich potential for implementing future generation functional devices. Among these, layered β′-In 2 Se 3 has fascinated researchers with its complex superlattice and domain structures. As opposed to ferroelectric α-In 2 Se 3 , the understanding of β′-In 2 Se 3 ferroic properties remains unclear because ferroelectric, antiferroelectric, and ferroelastic characteristics have been separately reported in this material. To develop useful applications, it is necessary to understand the microscopic structural properties and their correlation with macroscopic device characteristics. Herein, using scanning transmission electron microscopy (STEM), we observed that the arrangement of dipoles deviates from the ideal double antiparallel antiferroelectric character due to competition between antiferroelectric and ferroelectric structural ordering. By virtue of secondharmonic generation, four-dimensional STEM, and in-plane piezoresponse force microscopy, the long-range inversion-breaking symmetry, uncompensated local polarization, and net polarization domains are unambiguously verified, revealing β′-In 2 Se 3 as an in-plane ferrielectric layered material. Additionally, our device study reveals analogous resistive switching behaviors of different types owing to polarization switching, defect migration, and defect-induced charge trapping/detrapping processes.

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Section: Resultsmentioning

confidence: 73%

In-Plane Ferrielectric Order in van der Waals β′-In₂Se₃

Wang,

Zhou,

et al. 2023

ACS Nano

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“…At the same time, the phonon modes of TiO 6 octahedra vibrations also change, and the mode with lower energy starts to red shift, while the other one starts to blue shift. It is well known that NBT shows oxygen octahedral tilting of a – a – a – in rhombohedral R 3 c symmetry, while the NBT-BT with tetragonal symmetry ( P 4 bm space group) shows octahedral tilting of a 0 a 0 c + . At temperatures higher than 170 °C, the energy variation of oxygen octahedra modes may be related to the transformation of octahedra tilting.…”

Section: Resultsmentioning

confidence: 99%

“…Among the various types of lead-free perovskite ferroelectric materials, the Na 0.5 Bi 0.5 TiO 3 (NBT) system has been widely investigated in the past few decades because of its excellent piezoelectric properties, especially the large electrostrain. − The relaxation characteristics of NBT-based solid solutions such as Na 0.5 Bi 0.5 TiO 3 -BaTiO 3 (NBT-BT) and Na 0.5 Bi 0.5 TiO 3 -K 0.5 Bi 0.5 TiO 3 (NBT-KBT), as well as the electric field-induced relaxor–ferroelectric phase transition provide great potential for the optimization of piezoelectric properties. − NBT-based materials also present hierarchical structural features, including oxygen octahedra tilting and superlattice diffractions, , various domain structures, , and special polar nanoregions (PNRs). , The studies of these hierarchical structures may provide the basis for designing high-performance piezoelectric and ferroelectric materials, which is an important topic in condensed matter physics and materials science.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric–Ferroelastic Transitions in (Na_0.5Bi_0.5)TiO₃-BaTiO₃ Single Crystals

Huangfu

Chen

Jiao

et al. 2023

ACS Appl. Mater. Interfaces

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The comprehensive understanding of (Na 0.5 Bi 0.5 )TiO 3 -BaTiO 3 (NBT-BT) lattice structure is highly desired to develop lead-free ferroelectric materials. However, most of the previous studies focused on the improvement of piezoelectric properties at room temperature, and many structural puzzles are left unclear. In this work, the lattice structure of a ferroelastic phase and the ferroelectric−ferroelastic transitions in both rhombohedral NBT and tetragonal NBT-8%BT single crystals are investigated in detail. Our results illustrate the complex process of the ferroelectric−ferroelastic transition of NBT. The variation of Ti−O modes and oxygen octahedra modes clearly indicates the gradual change of lattice symmetry from R3c to P4bm during a wide temperature range between 170 and 350 °C. A ferroelectric−ferroelastic transition is also confirmed in tetragonal NBT-8BT for the first time, and the lattice symmetry of P4bm is found to be maintained during the ferroelastic stage. This work reveals the lattice evolutions of the ferroelectric−ferroelastic transition of NBT-BT crystals and provides new insights for understanding the ferroelasticity and the evolution of phonon modes in a lead-free relaxor.

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Electric field-induced two-step phase transformation and its contribution to the electromechanical strain in lead-free relaxor-based ceramics

Yang

Zhao

Zhuang

et al. 2023

Journal of the European Ceramic Society

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Nanoscale polar regions embedded within ferroelectric domains in Na1/2Bi1/2TiO3−BaTiO3

Cited by 5 publications

References 47 publications

In-Plane Ferrielectric Order in van der Waals β′-In₂Se₃

In-Plane Ferrielectric Order in van der Waals β′-In₂Se₃

Ferroelectric–Ferroelastic Transitions in (Na_0.5Bi_0.5)TiO₃-BaTiO₃ Single Crystals

Electric field-induced two-step phase transformation and its contribution to the electromechanical strain in lead-free relaxor-based ceramics

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Nanoscale polar regions embedded within ferroelectric domains in Na1/2Bi1/2TiO3−BaTiO3

Cited by 5 publications

References 47 publications

In-Plane Ferrielectric Order in van der Waals β′-In2Se3

In-Plane Ferrielectric Order in van der Waals β′-In2Se3

Ferroelectric–Ferroelastic Transitions in (Na0.5Bi0.5)TiO3-BaTiO3 Single Crystals

Electric field-induced two-step phase transformation and its contribution to the electromechanical strain in lead-free relaxor-based ceramics

Contact Info

Product

Resources

About

In-Plane Ferrielectric Order in van der Waals β′-In₂Se₃

In-Plane Ferrielectric Order in van der Waals β′-In₂Se₃

Ferroelectric–Ferroelastic Transitions in (Na_0.5Bi_0.5)TiO₃-BaTiO₃ Single Crystals