Dielectric properties of Sb_2O_3-doped Ba_(0.672)Sr_(0.32)Y_(0.008)TiO_3

摘要

Sb_2O_3-doped Ba_(0.672)Sr_(0.32)Y_(0.008)TiO_3 (BSYT) dielectric ceramics were prepared by conventional solid state method, and their dielectric properties were investigated with variation of Sb_2O_3 doping content and sintering temperature. The X-ray diffraction patterns indicated that all the BSYT specimens possessed the perovskite polycrystalline structure. The experimental results reveal that the introduction of Sb_2O_3 into Ba_(0.672)Sr_(0.32)Y_(0.008)TiO_3 can control the grain growth, reduce the relative dielectric constant and dielectric loss, shift the Curie temperature to lower temperature and significantly improve the thermal stability of the BSYT ceramics. The samples doped with 1.6 wt.% Sb_2O_3 sintered at 1320℃ for 2 h exhibited attractive properties, including high relative dielectric constant (> 1500), low dielectric loss (< 40 x 10~(-4)), low temperature coefficient of capacitor(< ±35%) over a wide temperature range from -25℃ to +85℃.