Dielectrlc Relaxation and Relaxor Behavior of (1-x)PbFe0.5Ta0.5O3-xPbTiO3 Ferroelectric Ceramics

(1-x)PbFe_0.5Ta_0.5O_3-xPbTiO₃ (PT) solid solution systems were prepared by a solid state reaction method. With increasing PbTiO₃, the phase transition temperature T_c linearly increased, and the corresponding dielectric behavior changed from a relaxor ferroelectrics to a normal ferroelectrics. One of them, the relaxor behavior of the 0.8PFT-0.2PT ceramics with x = 0.2 were observed at T_c = 64degC. The ferroelecreic P-E hysteresis loops of the ceramics still remained above the T_c. The dielectric relaxation and ferroelectric relaxor behaviors were investigated.