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Highly porous barium strontium titanate ( BST ) ceramic foams with low dielectric constant from particle‐stabilized foams
Author(s) -
Huo Wenlong,
Chen Yugu,
Zhang Zaijuan,
Liu Jingjing,
Yan Shu,
Wu JiaMin,
Zhang Xiaoyan,
Yang Jinglong
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15305
Subject(s) - materials science , dielectric , porosity , ceramic , composite material , sintering , particle (ecology) , particle size , strontium titanate , mineralogy , chemical engineering , chemistry , oceanography , optoelectronics , engineering , geology
Abstract 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.