Abstract
The effects of substitution Sb for Ta on the sintering behavior and the microwave dielectric properties of Ba3LiTa3Ti5O21 ceramic were studied. Single-phase polycrystalline microwave dielectric ceramics Ba3LiTa3-xSbxTi5O21(x = 0-3) were prepared by the solid-state reaction method. The sintering behavior and microwave dielectric properties of Ba3LiTa3-xSbxTi5O21 ceramics were found to be affected by Sb substitution for Ta. With the increasing Sb content, the densified (>95 % of their theoretical X-ray density) temperatures of Ba3LiTa3-xSbxTi5O21 ceramics increased from 1,160 to 1,220 degrees C, the dielectric constant (epsilon(r)) decreased from 55.5 to 27, and the Q d f value enhanced significantly from 18,480 to 29,400 GHz, with tau(f) improving from 70 to -25 ppm/degrees C. A near zero tau(f) value could be obtained by carefully adjusting the Sb content.