Dielectric and Energy Storage Properties of BaO-SrO-Na^sub 2^O-Nb^sub 2^O^sub 5^-SiO2 Glass-Ceramics with Different Crystallization Times

A series of BaO-SrO-Na^sub 2^O-Nb^sub 2^O^sub 5^-SiO2 (BSNNS) glass-ceramics have been prepared via controlled crystallization by varying the crystallization times from 1 min to 1000 min, and grain sizes of crystallized ceramic phases from dozens to hundreds of nanometers were obtained. Dielectric properties of BSNNS glass-ceramics were investigated. The permittivity and the temperature and electric field dependence of the permittivity are all related to crystallization time strongly. In addition, the energy density increases gradually, while the energy efficiency decreases with the increasing crystallization time. The maximum energy efficiency of 96.7% is obtained in the sample with crystallization time of 1 min, which is mainly attributed to low interfacial polarization.