Effects of oxygen vacancies and grain sizes on the dielectric response of BaTiO3

Youn Kyu Choi; Takuya Hoshina; Hiroaki Takeda; Takeshi Teranishi; Takaaki Tsurumi

doi:10.1063/1.3508947

Effects of oxygen vacancies and grain sizes on the dielectric response of BaTiO₃

Youn Kyu Choi, Takuya Hoshina, Hiroaki Takeda, Takeshi Teranishi, Takaaki Tsurumi

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

The effects of grain size and oxygen vacancies on the dielectric responses of BaTiO₃ ceramics were investigated using wideband dielectric spectroscopy. Both dipole and ionic polarizations were enhanced by the reduction in grain size down to 2.5 μm. The annealing in low oxygen partial pressure markedly suppressed the dipole polarization possibly due to the domain-wall clamping by oxygen vacancies. To explain the dielectric response of BaTiO ₃ ceramics, a complex structure including gradient lattice strain layers (GLSL) were proposed as a model of 90° domain structure.

Original language	English
Article number	212907
Journal	Applied Physics Letters
Volume	97
Issue number	21
DOIs	https://doi.org/10.1063/1.3508947
Publication status	Published - Nov 22 2010
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Effects of oxygen vacancies and grain sizes on the dielectric response of BaTiO3",

abstract = "The effects of grain size and oxygen vacancies on the dielectric responses of BaTiO3 ceramics were investigated using wideband dielectric spectroscopy. Both dipole and ionic polarizations were enhanced by the reduction in grain size down to 2.5 μm. The annealing in low oxygen partial pressure markedly suppressed the dipole polarization possibly due to the domain-wall clamping by oxygen vacancies. To explain the dielectric response of BaTiO 3 ceramics, a complex structure including gradient lattice strain layers (GLSL) were proposed as a model of 90° domain structure.",

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AU - Choi, Youn Kyu

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AU - Teranishi, Takeshi

AU - Tsurumi, Takaaki

N1 - Funding Information: The authors would like to thank Professor C. A. Randall for providing the information on oxygen partial pressure control during annealing. This work was supported by the Global COE program at the Tokyo Institute of Technology.

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AB - The effects of grain size and oxygen vacancies on the dielectric responses of BaTiO3 ceramics were investigated using wideband dielectric spectroscopy. Both dipole and ionic polarizations were enhanced by the reduction in grain size down to 2.5 μm. The annealing in low oxygen partial pressure markedly suppressed the dipole polarization possibly due to the domain-wall clamping by oxygen vacancies. To explain the dielectric response of BaTiO 3 ceramics, a complex structure including gradient lattice strain layers (GLSL) were proposed as a model of 90° domain structure.

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Effects of oxygen vacancies and grain sizes on the dielectric response of BaTiO₃

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