期刊
APPLIED PHYSICS LETTERS
卷 93, 期 19, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3027067
关键词
barium compounds; crystal structure; ferroelectric materials; nanoparticles; particle size; permittivity
资金
- Japan Society for the Promotion of Science
- Japan Synchrotron Radiation Research Institute [2006A1618]
Nanostructures of barium titanate (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 did not 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.
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