Microstructure and dielectric properties of (Ba, Sr)TiO3 ceramics with alkali-free glasses

(Ba, Sr)TiO3 ceramic attracts much interest due to its adjustable dielectric performance and outstanding dielectric properties. Alkali-free multi-component glasses with their high dielectric breakdown strength are considered as one of the promising candidates for next-generation high energy density storage capacitor applications. In the present study, oxalate co-precipitation method has been applied to obtain (Ba, Sr)TiO3 nanopowders, which were used to fabricate composite with Ba–B–Al–Si glass and (Ba, Sr)TiO3 ceramic. The parameters, such as the sintering temperature, dielectric constant, and breakdown strength were studied. The results indicated that the sintering temperature and the dielectric constant decreased with increasing the glass content, while the breakdown strength increased firstly and then decreased due to the modification of the microstructure. The effect of different alkali-free glass additions on the sintering temperature and dielectric properties of (Ba, Sr)TiO3 were studied. The composite with 13.5 vol.% Ba–B–Zn glass phase was sintered at 920 °C and showed optimal electrical properties.