Study on the structure and dielectric properties of BaO–SiO2–B2O3 glass-doped (Ba,Sr)TiO3 ceramics

(Ba,Sr)TiO3 (BST)-based ferroelectric glass-ceramic powders with different BaO–SiO2–B2O3 glass content, ranging from 0 to 30 mol%, were prepared by a sol–gel process. The crystalline structure and morphology were studied by XRD and SEM, respectively. The temperature dependence of dielectric constant and loss (ε − T), dielectric constant versus applied dc field (C–V) was measured for the BST glass-ceramics. Effects of doping glass on the structures and the dielectric characteristics of the BST glass-ceramics were discussed. Experimental results show that the BST glass-ceramics with pure perovskite phase can be well sintered at a lower temperature compared to the conventional BST ceramics. The dielectric constant and tunability decrease with the increasing of glass content. The sample with a glass content of 2 mol% shows a dielectric constant tunability of 37.1% and a dielectric loss of 0.008 at the paraelectric state.