Study of Structure and Dielectric Properties of (Ba_(1-x)Ca_x)(Ti_(0.82)Zr_(0.18)O_3 Ceramics

(Ba1-xCax)(Ti0.82Zr0.18)O3(BCZT,0≤x≤0.26) ceramics was prepared by a solid phase reaction.The effect of Ca2+ doping on the microstructure and dielectric properties of the ceramics was studied.Results showed that the solid solubility lay around x=0.16 for BCZT ceramics while the second phase was observed.The value of c/a changed as the U-type curve with the variation of the Ca2+,and the minimum of the c/a was 1.00276 at x=0.06.It was found that Ca2+ ion substitution can be almost incorporated into the A site by the calculation of the tolerance factor and lattice constant.With increasing Ca2+ ion content,the grain size was decreased.The Curie temperature was shifted to low temperature,and the er-T peak was decreased and broaden.The relaxor characteristics were obtained while Ca2+ ion content was further increased.