Divide line between relaxor, diffused ferroelectric, ferroelectric and dielectric

The dielectric spectroscopic studies of relaxor ferroelectric Ba(Ti0.70Sn0.30)O-3 (BTS30), diffused ferroelectric Ba(Ti0.70Sn0.20)O-3 (BTS20), classical ferroelectric BaTiO3 (BT0), and normal dielectric Ba(Fe0.50Ta0.50O3) (BFT) were carried out in the temperatures similar to 100 K-650 K, and frequencies similar to 100 Hz-1 MHz, which showed relaxor behavior at 130 K with typical 30 K frequency dispersion, perfect diffused ferroelectric character at 190 K, classical ferroelectric, and dielectric relaxation at 450 K-550 K respectively. A divide line was sketched between the relaxors, ferroelectrics and normal dielectrics based on the Maxwell-Wagner space charge model. The impedance spectroscopy and ac conductivity spectroscopy were carried out to explain the relaxor and pseudo relaxor behavior. (C) 2008 Elsevier Ltd. All rights reserved.