Dielectric dispersion behavior of Ba(ZrxTi1-x)O3 solid solutions with a quasiferroelectric state

The temperature dependence of dielectric permittivity was investigated for the barium zirconium titanate solid solution system [BZT, Ba(ZrxTi1-x)O-3 0.25 <= x <= 0.5]. The dielectric relaxation behavior was observed in these ferroelectrics with diffused phase transition. In contrast to the canonical relaxors such as Pb(Mg1/3Nb2/3)O-3, the diffused phase transition of BZT could not be well described by the popular modified Curie-Weiss law. Quasiferroelectric state theory was introduced to explain the dielectric results of the BZT relaxors. (c) 2008 American Institute of Physics.