Study of Structure and Dielectric Properties of (Ba1-xCax)(Ti0.82Zr0.18)O3 Ceramics

doi:10.3724/SP.J.1077.2011.00655

Abstract

Abstract: (Ba_1-xCa_x)(Ti_0.82Zr_0.18)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 εr-T peak was decreased and broaden. The relaxor characteristics were obtained while Ca²⁺ ion content was further increased.

Key words: BCZT ceramics, solid solubility, tetragonality of c/a, dielectric properties

CLC Number:

TM22

NA Wen-Ju, DING Shi-Hua, SONG Tian-Xiu, WANG Jiu-Shi, WANG Yan. Study of Structure and Dielectric Properties of (Ba_1-xCa_x)(Ti_0.82Zr_0.18)O₃ Ceramics[J]. Journal of Inorganic Materials, 2011, 26(6): 655-658.

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Study of Structure and Dielectric Properties of (Ba_1-xCa_x)(Ti_0.82Zr_0.18)O₃ Ceramics

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