Structural and Dielectric Properties of Ag(Nb0.8Ta0.2)1−xSbxO3 (x≤0.08) Ceramics |
| |
Authors: | Xiuying Guo Ning Zhu Mi Xiao Xiawan Wu |
| |
Affiliation: | School of Electric Information and communication Engineering, Tianjin University of Technology, Tianjin 300191, China; School of Electric Information Engineering, Tianjin University, Tianjin 300072, China |
| |
Abstract: | Sb2O5 were selected to substitute (Nb0.8Ta0.2)2O5 and the effects of Sb substitution on the dielectric properties of Ag(Nb0.8Ta0.2)O3 ceramics were studied. The perovskite Ag(Nb0.8Ta0.2)1? x Sb x O3 ceramics showed no obvious change with x value being no more than 0.08, and the pseudoperovskite unit cell parameters a = c , b and monoclinic angle β decrease with Sb concentration increasing. The dielectric properties of Ag(Nb0.8Ta0.2)1? x Sb x O3 ceramics were found to be affected greatly by the substitution of Sb for Nb/Ta. The ? value of Ag(Nb0.8Ta0.2)1? x Sb x O3 ceramics sintered at their densified temperature increased from 480 to 825 with x from 0 to 0.08, the tan δ value decreased sharply from 0.0065 to 0.0023 (at 1 MHz) with x increasing from 0 to 0.04, and then kept a stable lower tan δ value ~0.0024 with x to 0.08. The temperature coefficient of capacitance values continuously decreased from a positive value of 1450 ppm/°C for x =0 to a negative value of ?38.52 ppm/°C for x =0.08. |
| |
Keywords: | |
|
|