Effect of Sb5+ substitution on the dielectric properties of Ag(Nb0.8Ta0.2)O3 ceramics

Sb2O5 were selected to substitute (Nb0.8Ta0.2)2O5 and the effects of substitution on the dielectric properties of Ag(Nb0.8Ta0.2)O3 ceramics were studied. The dielectric properties of Ag(Nb0.8Ta0.2)1−xSbxO3 ceramics were found to be improved by the substitution of Sb for Nb/Ta. The ε value of Ag(Nb0.8Ta0.2)1−xSbxO3 ceramics sintered at 1060 °C 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/°C for x = 0 to − 38.5 ppm/°C for x = 0.08. The Ag(Nb0.8Ta0.2)1−xSbxO3 ceramics with x = 0.08 sintered at 1050 °C exhibited the optimum dielectric properties of ε ∼ 854, tanδ ∼ 0.0024 (1 MHz), and TCC ∼ 36.86 ppm/°C.