Dielectric properties of Mg-doped Ba0.6Sr0.4TiO3 ceramic sintered at a low temperature with Li2O additve

Dielectric properties of Mg-doped Ba0.6Sr0.4TiO3 ceramics with the aid of Li2O have been investigated. 3.0wt% Li2O additive samples can be sintered at 900 degrees C for 4h and sintering temperature remarkably decrease. Phase and microstructure of these samples were analyzed using XRD and SEM. Results show no obvious secondary phase and decreased grain-size as MgO content increased. Dielectric constant is decreased and the Curie temperature is shifted to low temperature and the peaks are suppressed and broaden with the increase of MgO. Tunability is decreased from about 30% to 15% with MgO content increasing from 0.15wt% to 5.0wt% under applied electric field of 40 kV/cm.