Sintering and properties of molybdenum-doped SrBi2Ta2O9 ceramics

The effects of molybdenum doping on the sintering, microstructure, dielectric properties, and ferroelectric properties of SrBi2(Ta1−xMox)O9+y ceramics were investigated. The densification process of the molybdenum doped ceramics with x=0.025–0.1 can be shifted to a lower temperature range. When the degree of densification is nearly the same, the doped ceramics showed reduced dielectric constant as compared with the undoped ceramics. For the ceramics with relative density ⩾90%, the dielectric constant is 120–125 and 80–120 for the undoped and doped ceramics, and the dielectric loss tangent is below 2%. For nearly the same relative density, all the molybdenum-doped ceramics have significantly increased Pr and decreased EC as compared with the undoped ceramics. There are optimum molybdenum content (x=0.025–0.05) and optimum sintering temperature (1100 °C) for maximum Pr and minimum EC.