Effect of Sb~(5+) substitution on the dielectric properties of Ag(Nb_(0.8)Ta_(0.2))O_3 ceramics

摘要

Sb_2O_5 were selected to substitute (Nb_(0.8)Ta_(0.2))_2O_5 and the effects of substitution on the dielectric properties of Ag(Nb_(0.8)Ta_(0.2))O_3 ceramics were studied. The dielectric properties of Ag(Nb_(0.8)Ta_(0.2))_(1-x)Sb_xO_3 ceramics were found to be improved by the substitution of Sb for Nb/Ta. The ε value of Ag(Nb_(0.8)Ta_(0.2))_(1-x)Sb_xO_3 ceramics sintered at 1060℃ increased from 430 to 825 with x increasing from 0 to 0.08, the tanδ value decreased sharply from 0.0085 to 0.0023 (at 1 MHz) with x increasing from 0 to 0.04, and then kept to a lower tanδ value ～0.0024 with x to 0.08. The TCC values decreased from +1450 ppm/℃ for x = 0 to -38.5 ppm/℃ for x = 0.08. The Ag(Nb_(0.8)Ta_(0.2))_(1-x)Sb_xO_3 ceramics with x = 0.08 sintered at 1050℃ exhibited the optimum dielectric properties of ε ～854, tanδ ～0.0024 (1 MHz), and TCC ～36.86 ppm/℃.