Study on Dy2O3-Doped Medium Temperature Sintering (Ba, Sr) TiO3 Series Capacitor Ceramics

摘要

The influence of Dy2O3 doping on the properties of medium temperature sintering (Ba, Sr)TiO3 series capacitor ceramics was studied by single factor various amount method, and the law of the influence on the medium temperature sintering (Ba, Sr)TiO3 series capacitor ceramics was obtained. The dielectric materials used for multilayer ceramic capacitor was obtained, of which the dielectric constant was 1375, the dielectric loss was 0.0060, the density was 5.92 g·cm-3,the sintering temperature was less than 1150 °C, the capacitance temperature changing rate (△C/C) was less than ± 15%, the voltage withstand strength was more than 9.3 kV·mm-1, and the crystal grain size was about 1 μm. The surface morphology of the sample doped with various amount Dy2O3 was analyzed by scanning electron microscope (SEM).The results showed that doping Dy2O3 could form defect solid solution, stop grain growth, fine crystal grain, widen curie peak, obtaining high dielectric constant and low dielectric loss, capacitance temperature property was suited for X7R character, in the (Ba, Sr)TiO3 series ceramics. At the same time, the voltage withstand strength was enhanced greatly.