日本結晶学会誌
Online ISSN : 1884-5576
Print ISSN : 0369-4585
最近の研究から
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
保科 拓也
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2009 年 51 巻 5 号 p. 300-305

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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.

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© 2009 日本結晶学会
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