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Size Effect of Dielectric Properties for Barium Titanate Particles and Its Model

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Abstract:

Powder dielectric measurement of barium titanate (BaTiO3) fine particles from 17 to 1,000 nm revealed a maximum dielectric constant at a certain particle size. The sizes with maximum dielectric constants were strongly dependent on preparation methods. When BaTiO3 fine particles were prepared in vacuum of 10-2 torr, a dielectric maximum of 15,000 was observed at 70 nm. On the other hand, when BaTiO3 fine particles were prepared in air, a dielectric maximum of 5,000 was observed at 140 nm. Structure refinement of BaTiO3 particles using a Rietveld method revealed that all of BaTiO3 particles were composed of two parts; (a) surface cubic layer and (b) bulk tetragonal layer. Moreover, a thickness of surface cubic layer for BaTiO3 particles prepared in vacuum was much thinner than that for BaTiO3 particles prepared in air. To explain the differences, a new model on the basis of “surface relaxation” was proposed.

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Info:

Periodical:

Key Engineering Materials (Volume 301)

Pages:

27-30

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.301.27

Citation:

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Online since:

January 2006

Authors:

Satoshi Wada, Takuya Hoshina, Hiroaki Yasuno, Masanori Ohishi, Hirofumi Kakemoto, Takaaki Tsurumi, Masatomo Yashima

Keywords:

2-Step Thermal Decomposition Method, Barium Titanate (BT), Dielectric Property, Particle Size, Size Effect, Surface Relaxation

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