Highly porous barium strontium titanate (BST) ceramic foams with low dielectric constant from particle‐stabilized foams

A novel method for fabrication of highly porous barium strontium titanate (BST) ceramic foams based on particle‐stabilized foaming method was developed for the first time, in which propyl gallate (PG) was employed as BST particle modifier. The results showed that the stability of wet BST foams close...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2018-04, Vol.101 (4), p.1737-1746
Main Authors: Huo, Wenlong, Chen, Yugu, Zhang, Zaijuan, Liu, Jingjing, Yan, Shu, Wu, Jia‐Min, Zhang, Xiaoyan, Yang, Jinglong
Format: Article
Language:English
Subjects:
barium strontium titanate
Barium strontium titanates
ceramic foams
Ceramics
dielectric constant
Dielectric loss
Foaming
Foams
particle‐stabilized foams
Permittivity
Pore size
Porosity
Sintering (powder metallurgy)
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Summary:A novel method for fabrication of highly porous barium strontium titanate (BST) ceramic foams based on particle‐stabilized foaming method was developed for the first time, in which propyl gallate (PG) was employed as BST particle modifier. The results showed that the stability of wet BST foams closely depends on the pH value and PG concentration, which could be explained by the adsorption behavior of PG on BST particle surface. BST ceramic foams with dense, uniform, and closed pore and defect‐free wall were obtained. The pore size and porosity can be well controlled by adjusting solid loading and sintering temperature. It was revealed that not only sintering temperature but also solid loading significantly influenced the growth of BST grain. The BST ceramic foams exhibited high porosity in the range of 81%‐95%, low dielectric constant in the range of 47‐150, and low dielectric loss below 0.0025. The BST ceramic foams with higher porosity presented a tendency of lower dielectric constant and the fitting results indicated that the natural logarithm of dielectric constant was linear correlated with porosity.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15305