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bluesky1803

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[交流] 【讨论】The effect of grain size

Recently, The effect of grain size of ferroelectric ceramics has been investigated widely, but the mechanism of it isn't studied clearly.I want to talk about it with you !!

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心诚则灵

1楼 2009-08-01 10:52:00

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Size Effect of Barium Titanate and Computer-Aided Design of Multilayered Ceramic Capacitors

Tsurumi, T. Hoshina, T. Takeda, H. Mizuno, Y. Chazono, H.

This paper appears in: Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Publication Date: August 2009
Volume: 56, Issue: 8
On page(s): 1513-1522
ISSN: 0885-3010
Digital Object Identifier: 10.1109/TUFFC.2009.1214
Current Version Published: 2009-07-31

Abstract
The size effect of BaTiO3 (BTO) is the most important issue to design multilayer ceramic capacitors (MLCCs) with high capacitance. In the size effect of BTO particles, the size dependence of dielectric permittivity related with the complex structure in BTO nano-particles. The grain size dependence of dielectric permittivity in BTO ceramics was due to the domain wall contribution. The core-shell structure played an important role in the size effect of dielectric layers in X7R-MLCCs. Computer simulation technique was developed to predict the limit of capacitance density of MLCCs produced by the current technology. Dielectric properties of MLCCs with different particle size of BTO were measured, and the data were analyzed using B-SPLINE fitting to predict dielectric permittivity at arbitrary temperatures and AC-fields. The dielectric properties of barium titanate grains smaller than 100 nm were predicted using least squares fitting of the B-SPLINE coefficients. It was found from the simulation that the use of barium titanate grains smaller than 80 nm did not give an advantage to increase the capacitance density as well as temperature stability of the MLCCs. The maximum capacitance was predicted for the 1608 (mm) chip size.