The ferroelectric phase transition in a 500 nm sized single particle of BaTiO<sub>3</sub> tracked by coherent X-ray diffraction

Oshime, Norihiro; Ohwada, Kenji; Machida, Akihiko; Fukushima, Nagise; Ueno, S.; Fujii, Ichiro; Wada, Satoshi; Sugawara, Kento; Shimada, Ayumu; Ueno, Tetsuro; Watanuki, Tetsu; Ishii, Kenji; Toyokawa, H.; Momma, Koichi; Kim, Sang–Wook; Tsukada, Shinya; Kuroiwa, Yoshihiro

doi:10.35848/1347-4065/ac7d94

Cited by 5 publications

(10 citation statements)

References 42 publications

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“…BTO NPs have been imaged before using this technique. [31][32][33] Figure 5a-d shows the BCDI reconstructions of the BTO ethanol, PG, butanediol, and 240 °C samples. We measured several nanocrystals from each set of synthesis conditions in our BCDI experiments, and the reconstructions shown here are representative.…”

Section: Bragg Coherent Diffraction Imaging Reconstructionsmentioning

confidence: 99%

Structural Explanation of the Dielectric Enhancement of Barium Titanate Nanoparticles Grown under Hydrothermal Conditions

Suzana

Liu

Diao

et al. 2023

Adv Funct Materials

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When synthesized under certain conditions, barium titanate (BaTiO 3 , BTO) nanoparticles are found to have the non-thermodynamic cubic structure at room temperature. These particles also have a several-fold enhanced dielectric constant, sometimes exceeding 6000, and are widely used in thin-layer capacitors. A hydrothermal approach is used to synthesize BTO nanocrystals, which are characterized by a range of methods, including X-ray Rietveld refinement and the Williamson-Hall approach, revealing the presence of significant inhomogeneous strain associated with the cubic phase. However, X-ray pair distribution function measurements clearly show the local structure is lower symmetry than cubic. This apparent inconsistency is resolved by examining 3D Bragg coherent diffraction images of selected nanocrystals, which show the existence of ≈50 nm-sized domains, which are interpreted as tetragonal twins, and yet cause the average crystalline structure to appear cubic. The ability of these twin boundaries to migrate under the influence of electric fields explains the dielectric anomaly for the nanocrystalline phase.

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Section: Bragg Coherent Diffraction Imaging Reconstructionsmentioning

confidence: 99%

Structural Explanation of the Dielectric Enhancement of Barium Titanate Nanoparticles Grown under Hydrothermal Conditions

Suzana

Liu

Diao

et al. 2023

Adv Funct Materials

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“…The acceleration voltage was 200 kV. The Bragg-CDI was carried out on the coherent X-ray scattering station installed at BL22XU of SPring-8. − The incident X-ray energy was set to 8 keV. The Pb 0.82 Sr 0.18 VO 3 particles were mounted onto a STEM grid (ELS-C10, Okenshoji) with a laminated structure consisting of a 15–20 nm-thick polymer, 20–25 nm-thick C, and 25 μm-thick Cu sheets.…”

Section: Methodsmentioning

confidence: 99%

Polar–Nonpolar Transition-Type Negative Thermal Expansion with 11.1% Volume Shrinkage by Design

et al. 2023

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Chemical substitution for the tuning of the working temperature of phase-transition-type negative thermal expansion (NTE) materials generally reduces the volume shrinkage during the transition. We have investigated the effects of electron doping and reduction of 6s 2 lone-pair activity in PbVO 3 with a large polar distortion (c/a = 1.23) and found that the combination of Bi and Sr substitutions for Pb enables a temperature-induced polar to nonpolar transition with 11% volume shrinkage, even larger than the pressure-induced volume collapse of PbVO 3 (∼10.6%), and is the largest value among the NTE materials reported so far. The domain structure of the coexisting cubic and tetragonal phases with such a huge volume difference was successfully observed by highangle annular dark-field scanning transmission electron microscopy and the spatial distribution of domains by Bragg coherent X-ray diffraction imaging. The temperature hysteresis is reduced by repeated heating/cooling cycles, suggesting that the changes in the domain structure dominate the NTE properties.

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“…For these measurements, the temperature was maintained between 303 K (30 °C) and 573 K (300 °C) within ±1 K. The measured temperature tolerances and drift velocities were similar to those reported in previous studies. 27,29)…”

Section: Sample Preparationmentioning

confidence: 99%

“…The CXD and Bragg-CDI experiments were carried out using the CDI instruments 26,27,30) installed at the BL22XU beamline in SPring-8. 31) Liquid-nitrogen-cooled Si(111) DCM-monochromatized X-rays, with energy tuned to 8 keV (λ = 1.5498 Å), were obtained from an in-vacuum undulator.…”

Section: Cxd Measurementsmentioning

confidence: 99%

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Lattice strain visualization inside a 400 nm single grain of BaTiO₃ in polycrystalline ceramics by Bragg coherent X-ray diffraction imaging

Oshime

Ohwada

Machida

et al. 2023

Jpn. J. Appl. Phys.

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The degree of anisotropy and the domain arrangement of crystal structures in ferroelectrics are affected by the grain boundaries and by the shape and size of the grains. To understand the grain boundary effects that occur in ferroelectric ceramics, we introduce a technique for nondestructively observing the internal lattice strain distribution of a submicrometer-sized ferroelectric grain in polycrystalline materials. The ferroelectric phase transition of a single grain in the polycrystalline materials was evaluated by tracking the changes in the Bragg coherent X-ray diffraction patterns. The internal lattice strain distribution of the grains in the paraelectric phase was visualized via Bragg coherent X-ray diffraction imaging. A pair of 90° domains in the ferroelectric phase were also imaged in three dimensions, and showed a domain boundary correlated with the internal lattice strain caused by the stresses from the adjacent grains.

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The ferroelectric phase transition in a 500 nm sized single particle of BaTiO₃ tracked by coherent X-ray diffraction

Cited by 5 publications

References 42 publications

Structural Explanation of the Dielectric Enhancement of Barium Titanate Nanoparticles Grown under Hydrothermal Conditions

Structural Explanation of the Dielectric Enhancement of Barium Titanate Nanoparticles Grown under Hydrothermal Conditions

Polar–Nonpolar Transition-Type Negative Thermal Expansion with 11.1% Volume Shrinkage by Design

Lattice strain visualization inside a 400 nm single grain of BaTiO₃ in polycrystalline ceramics by Bragg coherent X-ray diffraction imaging

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The ferroelectric phase transition in a 500 nm sized single particle of BaTiO3 tracked by coherent X-ray diffraction

Cited by 5 publications

References 42 publications

Structural Explanation of the Dielectric Enhancement of Barium Titanate Nanoparticles Grown under Hydrothermal Conditions

Structural Explanation of the Dielectric Enhancement of Barium Titanate Nanoparticles Grown under Hydrothermal Conditions

Polar–Nonpolar Transition-Type Negative Thermal Expansion with 11.1% Volume Shrinkage by Design

Lattice strain visualization inside a 400 nm single grain of BaTiO3 in polycrystalline ceramics by Bragg coherent X-ray diffraction imaging

Contact Info

Product

Resources

About

The ferroelectric phase transition in a 500 nm sized single particle of BaTiO₃ tracked by coherent X-ray diffraction

Lattice strain visualization inside a 400 nm single grain of BaTiO₃ in polycrystalline ceramics by Bragg coherent X-ray diffraction imaging