Dielectric properties of Ba1-xSrxTiO3 prepared by SAG method

Ba1-xSrxTiO3(r=0, 0.3, 0.5 and 0.7) were synthesized by the SAG method. XRD revealed a cubic structure at room temperature. From the temperature dependence of the dielectric permittivity, the Curie temperature was measured. Although it decreases linearly with increasing x, it is obviously lower than that of the ceramics made by traditional method. The lowering of Curie temperature and disappearance of the trigonal-orthorhombic and orthorhombic-tetragonal phase transitions might be caused by the impurity Fe3+ and the excess of Ba at the grain surface.