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Abstract
The enhancement of dielectric relaxation behavior of lead-free Zr^sup 4+^ doped Ba^sub 0.9^Ca^sub 0.1^Zr^sub x^Ti^sub 1-x^O3-0.03Bi^sup 3+^ ceramics prepared by hydrothermal method were studied. The XRD patterns and calculated lattice parameters both indicated a phase transition from tetragonal to cubic phase with x increasing from 0.00 to 0.12. And the increasing Zr exhibits the homogenization of grain size from SEM patterns. Compositions of x = 0.00 and 0.03 were normal ferroelectrics with sharp T ^sub m^ peak while the samples exhibit strong relaxation behavior at x = 0.09 and 0.12 and the relaxation parameters were calculated. Thus the lead-free Ba^sub 1-x^Ca^sub x^Ti^sub 1-x^Zr^sub x^O3 system relaxor ferroelectrics were obtained. The P-E loops of all these samples can be divided into two types: the broad and the narrow, which was probably attributed to the grain size and phase transition at room temperature.