Structure and Mechanism of Ultrahigh Dielectric Properties for Barium Titanate Nanoparticles
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- HOSHINA Takuya
- Graduate School of Science and Engineering, Tokyo Institute of Technology
Bibliographic Information
- Other Title
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- チタン酸バリウムナノ粒子の構造と巨大誘電特性の発現機構
- チタンサン バリウムナノ リュウシ ノ コウゾウ ト キョダイ ユウデン トクセイ ノ ハツゲン キコウ
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Abstract
Almost impurity- and defect-free barium titanate (BaTiO3) nanoparticles with various sizes from 20 to 430 nm were prepared using 2-step thermal decomposition method. The powder dielectric measurement method indicated that the dielectric permittivity of BaTiO3 particles with a particle size of 140 nm exhibited a dielectric maximum of 5,000. Nano-structures of BaTiO3 nanoparticles were analyzed using a composite structure model. It was found that BaTiO3 nanoparticles had a composite structure consisting of (i) inner tetragonal core, (ii) gradient lattice strain layer (GLSL) and (iii) surface cubic layer. The crystal structure of each region didn’t depend on particle size while the volume fraction of the GLSL and the surface cubic layer increased with decreasing the particle size. These results suggested that the size effect of BaTiO3 nanoparticles originated from the composite structure.
Journal
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- Nihon Kessho Gakkaishi
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Nihon Kessho Gakkaishi 51 (5), 300-305, 2009
The Crystallographic Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204086711040
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- NII Article ID
- 10026107548
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- NII Book ID
- AN00188364
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- COI
- 1:CAS:528:DC%2BD1MXhsFSgtbzE
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- ISSN
- 18845576
- 03694585
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- NDL BIB ID
- 10484309
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed