The effect of Hf doping on the dielectric and energy storage performance of barium titanate based glass ceramics

A series of (1-x) (BaO–TiO2–SiO2–Al2O3–B2O3)-xHfO2 (abbreviated as (1-x)BTSAB-xH) glass-ceramics were designed and prepared by traditional melt quenching and heat treatment method. The dielectric and energy storage properties of the glass-ceramics were studied systematically. The results of X-ray diffraction indicate that the main crystal phase of (1-x) BTSAB-xH glass-ceramics is BaTiO3. It should be noted that the addition of HfO2 can not only increase the dielectric constant, but also enhance the breakdown dielectric strength, resulting in high theoretical energy storage density. The max theoretical energy storage density can reach up to 7.07 J/cm3. The discharged energy storage density is 0.73 J/cm3 measured at 300 kV/cm @ room temperature. These results show that Hf doped barium titanate-based glass-ceramics are promising materials for application in dielectric capacitor with high energy storage density.