Process and microstructure to achieve high dielectric constant in ceramic-glass composites for energy storage applications

A ceramic-glass composite with high dielectric constant is fabricated by using vacuum pretreated BaTiO3 nanoparticles and SiO2 glass coating layers, the effect of process and microstructure on the dielectric properties of the composites was investigated. As the content of glass coated on BaTiO3 particles is increasing, the composites are showing the decreasing dielectric constant, decreasing dielectric loss and increasing breakdown. When the composite with 2.5 wt.% SiO2 was sintered at 1230 °C, its energy density reached a maximum value of 1.66 J/cm3. The produced composite disks are showing a high dielectric constant of 3000 and a low dielectric loss of 0.03 at the testing frequency of 100 Hz. A better dielectric stability with changing temperature were also achieved, which also makes the materials potential for a variety of applications.