Study of Dielectric Relaxation Behavior of Co-doped BCZT Ceramics

Ba0.9175Ca0.08Nd0.0025(Zr0.18Ti0.8175-xYxMn0.0025)O3(BCZT-Y, x=0, 0.5mol%, 0.75mol%, 1.0mol%, 1.5mol%, 2.0mol%) ferroelectric ceramics was prepared by a solid phase reaction. The influence of Y3+ doping on the structure and dielectric properties of BCZT-Y ceramics was investigated. Results showed that with the Y3+ contents increasing, Y3+ ion substitution can be almost incorporated into the Ti4+ site, and the density of BCZT-Y ceramics increased from 4.029 g/cm3 to 6.058 g/cm3. The Curie temperature was shifted to lower temperature, and the εr-T peak was decreased and broaden. The ferroelectric relaxor characteristics were obtained while Y3+ ion content was further increased, which were consistent with the Lorenz-type formula fitting. It was found that the area of ferroelectric hysteresis loop became narrow and slant, the remnant polarization (Pr) and coercive field (Ec) reduced with the increase of Y3+ content.