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

Abstract:

Article Preview

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.

Info:

Periodical:

Edited by:

Masaru Miyayama, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki

Pages:

27-30

DOI:

10.4028/www.scientific.net/KEM.301.27

Citation:

S. Wada et al., "Size Effect of Dielectric Properties for Barium Titanate Particles and Its Model", Key Engineering Materials, Vol. 301, pp. 27-30, 2006

Online since:

January 2006

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.