Crystallization, microstructure and dielectric properties of the SrO-BaO-Nb2O5-Al2O3-SiO2 based glass ceramics added with ZrO2

The SrO-BaO-Nb2O5-Al2O3-SiO2 (SBN-AS) based glass ceramics with different ZrO2 content were synthesized via the glass melting process and temperature controlled crystallization. The influences of adding different amounts of ZrO2 on the microstructure, crystallization and dielectric properties of SBN-AS based glass ceramics were investigated. Among the studied SBN-AS based glass ceramics with different ZrO2 content, the dielectric constant of the SBN-AS based glass ceramics increases from108.9 to 135.9 with the ZrO2 content when the ZrO2 is lower than 0.5 mol% and then decreases when higher than 1.0 mol%. The breakdown strength of the SBN-AS based glass ceramics first gradually increases from 1111.2 to 1129.4 kV/cm with the ZrO2 content and then increases quickly from 1291.6 to 1377.7 kV/cm when the ZrO2 content is higher than 1.0 mol%. For the 1.0 mol% of ZrO2 content added, the maximum value of energy storage density for the resulting glass -ceramic is 8.9 J/cm(3), which is about 113% greater than that of the SBN-AS based glass ceramic without ZrO2 addition. The enhanced energy storage density could be attributed to a few ZrO2 content added into the SBN-AS based glass ceramics as nucleating agents at and excess content ZrO2 as network agents.