Preparation of Fine Ceramic Ba_(0.65)Sr_(0.35)TiO_3 Materials and Their Dielectric Properties

Ba0.65Sr0.35TiO3 materials were prepared by sol-gel processing and microwave sintering, their dielectric properties were studied and compared with the same compositional material prepared by conventional processing. The results show that the synthetic temperature of the BST powder can be reduced from 1100℃to 900℃, and the BST ceramic with fine grain (- 1μm) can be obtained by microwave sintering at 1310℃ for 25 minutes. With the decreasing of grain size, the relative dielectric constant of the samples changes slightly and the dielectric loss reduces greatly. The decrease of dielectric loss is attributed to the presence of an internal stress in the fine-grained BST ceramics.