Effect of Liquid‐Phase Sintering on the Breakdown Strength of Barium Titanate

Abstract

A glass used to liquid‐phase sinter BaTiO3 was developed and its properties were tested to determine the feasibility of using this glass to aid densification behavior. Glass was added to pure BaTiO3 powder and pressed into dimpled pellets with glass contents varying from 4 to 20 vol%. The breakdown strength was measured and compared with pure BaTiO3 and two commercially available dielectric materials. Liquid‐phase sintering increased the breakdown strength of pure BaTiO3 for all the compositions tested. The breakdown strength of the samples containing 20 vol% glass additions was increased by a factor of 2.8 compared with pure BaTiO3.

Preparation of DC-bias-free (Ba, Sr)TiO₃-Bi(Mg, Ti)O₃-NaNbO₃ Ceramics with Reduced Temperature Dependent Dielectric Properties

“…It is interesting to note that the E B values tended to increase with grain size. This trend was opposite to that observed for oxides such as TiO 2 , MgO, and BaTiO 3 [7]. Further study is needed to elucidate the grain size effect on the E B values for the ceramics.…”

“…Effect of the grain size on the dielectric properties including the dielectric breakdown strength (E B ), a measure of reliability, was also studied for a selected composition. This was because the dielectric properties were strongly dependent on grain size in BT and (Ba, Sr)TiO 3 based ceramics and the E B value was influenced by grain size for some oxides [7].…”

Microstructures and dielectric properties of Ba0.4Sr0.6TiO3 ceramics with BaO–TiO2–SiO2 glass–ceramics addition

“…The glass additives can decrease the sintering temperature and modify the microstructure of BST, the improvement of breakdown strength can be attributed to the reduction of grain size, the decrease of porosity, and a more homogeneous microstructure [13][14][15][16]. Among various systems of glasses, B 2 O 3 -SiO 2 -based glasses, such as BaO-B 2 O 3 -SiO 2 , SrO-B 2 O 3 -SiO 2 , CaO-B 2 O 3 -SiO 2 [8][9][10][11][12], possess higher breakdown strength and well wetting with BST ceramics, which should be effective additives in improving the energy storage density of BST ceramics.…”

“…Besides a high E b , a large variation of polarization is another key factor, which is related to the dielectric constant to a certain extent [5]. Considering the two factors, the addition of glasses to BST ceramics has widely been investigated for achieving high energy density recently [7][8][9][10][11][12][13][14][15][16].…”

Dependence of dielectric properties on microstructural characteristics of (Ba0.7Sr0.25Ca0.05)(Ti0.9Zr0.1)O3 ceramics

“…However, electrostriction and the corresponding inner electric-field induced stress of MLCCs in strong alternating electric fields cause heating and may result in cracking and breaking down of the dielectric properties [1][2][3][4][5]. To enhance the dielectric properties of BaTiO 3 -based ceramics, corresponding to high dielectric constant and breakdown voltage, the dielectric material should have high relative density and homogeneous microstructure with small grains [6,7].…”