Relaxor behaviors and tunability in BaZr(0.35)Ti(0.65)O3 ceramics

Barium zirconate titanate Ba(Zr0.35Ti0.65)O-3 (BZT35) ceramics were prepared by solid state reaction. The diffuse phase transition of BZT35 ceramics was investigated. The temperature dependence of dielectric properties was measured in the frequency range from 100 Hz to 100 kHz. The broad dielectric anomaly accompanied with the shift of dielectric maximum toward a higher temperature with the increasing of frequency indicates the relaxor behaviors in the ceramic. The index of relaxation (gamma) and the broadening parameter (,A) were estimated from a linear fitting of the modified Curie-Weiss law. The value of gamma = 1.91 and Delta = 44.9 K at I kHz indicates the strong relaxor nature. A remarkably good fitting to the Vogel-Fulcher relation further supports such a relaxor nature. High tenability obtained in BZT35 ceramics was investigated, which imply that the ceramic is promising materials for tunable capacitor applications. (c) 2006 Elsevier B.V. All rights reserved.