Orthorhombic phase1 of BCST at room temperature is characterized by single peak at around 2θ of 46◦, when x = 0.01 and 0.02. The BCST ceramics become tetragonal structures, featured with splitting of the (0 0 2)/(2 0 0) peaks at around 2θ of 46◦ with further increase of Ca content.18,19 The BCST ceramics possess pure tetragonal phase, when x = 0.04.