Abstract
The heat capacity and dielectric constant were measured from liquid helium temperature to 420K on BaTi1-xZrxO3 synthesized by a conventional solid state reaction method for x=0∼0.90. In the samples of x≤0.3, typical ferroelectric phase transition was observed in the heat capacity and dielectric constant. The heat capacity anomaly became smaller with increasing x, and disappeared for the samples of x≥0.35, where relaxor-like behavior was observed in the dielectric constant. This result indicates that the mechanism of the relaxor behavior in BaTi1-xZrxO3 systems is different from that of PMN, in which the order-disorder type phase transition may be frozen in a glassy state at low temperatures. The relaxor behavior of BaTi1-xZrxO3 systems may be attributed to the freezing of displacive-type phase transition.
