Composite structure and size effect of barium titanate nanoparticles

Hoshina, Takuya; Wada, Satoshi; Kuroiwa, Yoshihiro; Tsurumi, Takaaki

doi:10.1063/1.3027067

Cited by 196 publications

(121 citation statements)

References 17 publications

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“…We firstly tried to analyze the XRD profiles using the Rietveld method, however the intensity bridges between the two diffraction lines could never be fitted by assuming single tetragonal phase or even surface cubic layers on BaTiO 3 particles. 23)25) Therefore, we employed a new composite structure model 26) for BaTiO 3 nanoparticles shown in Fig. 3, where a BaTiO 3 particle is assumed to consist of three regions, i.e., (i) an inner tetragonal core, (ii) a gradient lattice strain layer (GLSL), and (iii) a surface cubic layer.…”

Section: Size Effect Of Batio 3 Fine Particlesmentioning

confidence: 99%

Size effect of barium titanate: fine particles and ceramics

Hoshina

2013

J. Ceram. Soc. Japan

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The size effect of ferroelectric materials is one of the most important issues to develop next-generation dielectric devices. In this paper, we reviewed our studies on the size effects of barium titante (BaTiO 3 ) fine particles and ceramics. In the size effect of BaTiO 3 fine particles, the maximum of dielectric permittivity was observed at a particle size of around 140 nm, and was explained by the composite structure model including a gradient lattice strain layer (GLSL) having a very high permittivity. In contrast, the grain size effect of BaTiO 3 ceramics, where the permittivity showed a maximum at a grain size of about 1.1¯m, was interpreted as the superposition effect of domain-wall contributions and grain boundary effect.

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Section: Size Effect Of Batio 3 Fine Particlesmentioning

confidence: 99%

Size effect of barium titanate: fine particles and ceramics

Hoshina

2013

J. Ceram. Soc. Japan

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176

121

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“…These findings are consistent with previous work reporting that the surface of a BT nanoparticle was composed of paraelectric cubic phase, while its inner core was the ferroelectric tetragonal phase. 14,15 For concave areas, although deformation of the outermost surface was not clearly observed, probably because the surface was polygonal rather than curved, compression/relaxation was detected in the pore wall [ Fig. 4(d)].…”

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confidence: 99%

Origin of thermally stable ferroelectricity in a porous barium titanate thin film synthesized through block copolymer templating

et al. 2017

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A porous barium titanate (BaTiO3) thin film was chemically synthesized using a surfactant-assisted sol-gel method in which micelles of amphipathic diblock copolymers served as structure-directing agents. In the Raman spectrum of the porous BaTiO3 thin film, a peak corresponding to the ferroelectric tetragonal phase was observed at around 710 cm−1, and it remained stable at much higher temperature than the Curie temperature of bulk single-crystal BaTiO3 (∼130 °C). Measurements revealed that the ferroelectricity of the BaTiO3 thin film has high thermal stability. By analyzing high-resolution transmission electron microscope images of the BaTiO3 thin film by the fast Fourier transform mapping method, the spatial distribution of stress in the BaTiO3 framework was clearly visualized. Careful analysis also indicated that the porosity in the BaTiO3 thin film introduced anisotropic compressive stress, which deformed the crystals. The resulting elongated unit cell caused further displacement of the Ti4+ cation from the center of the lattice. This displacement increased the electric dipole moment of the BaTiO3 thin film, effectively enhancing its ferro(piezo)electricity.

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“…This continuous change in the tetragonal core was termed the gradient lattice strain layer (GLSL). 15) In Fig. 4, the solid curve represents the particle-size dependence of the tetragonal core in each particle, whereas the rectangles represent the results obtained by Hoshina et al 15) It was found that the tetragonal core rate diminishes with decreasing particle size.…”

Section: Resultsmentioning

confidence: 97%

“…15) In Fig. 4, the solid curve represents the particle-size dependence of the tetragonal core in each particle, whereas the rectangles represent the results obtained by Hoshina et al 15) It was found that the tetragonal core rate diminishes with decreasing particle size. This phenomenon was explained by the decrease in the ferroelectricity with decreasing particle size, because the inner tetragonal core phase is a ferroelectric phase and the surface cubic layer is a paraelectric phase.…”

Section: Resultsmentioning

confidence: 97%

Theoretical analysis of surface effect of crystal and its application to BaTiO3 fine particle

Aikawa

Iwazaki

Suzuki

2010

J. Ceram. Soc. Japan

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The internal structure of a fine particle of barium titanate is studied by the variational principle method on the basis of the selfconsistent anharmonic theory. An anharmonic oscillator is used as a trial Hamiltonian, and Morse potential is assumed as the interatomic potential in the particle. It is concluded that the structure of the vertical section of a ferroelectric particle has a gradient distribution from the ferro phase at the center to the para phase at the surface.

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Composite structure and size effect of barium titanate nanoparticles

Cited by 196 publications

References 17 publications

Size effect of barium titanate: fine particles and ceramics

Size effect of barium titanate: fine particles and ceramics

Origin of thermally stable ferroelectricity in a porous barium titanate thin film synthesized through block copolymer templating

Theoretical analysis of surface effect of crystal and its application to BaTiO3 fine particle

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