Temperature Dependence of the Ferroelectric Properties of PLZT 6/58/42 Ceramics with Sb₂O₅ Addition

Abstract

For a simple chemical composition of PLZT 6/58/42 with 1 wt% Sb₂O₅ addition, excellent dielectric and piezoelectric properties of ε_r = 4770, tgδ = 2.4%, d₃₃ = 800 pC/N, k_p = 0.70, Q_m = 46, k_t = 0.54 and T_m = 185°C can be obtained. The temperature dependence of dielectric constant at different frequencies shows that the as-prepared samples are relaxor ferroelectrics. By measuring ferroelectric hysteresis loops at different temperature, it is found that T_f = 122°C is an anomalous point. Above T_f, the remnant polarization P_r decreases rapidly and reaches to zero at T_d = 130°C. The results suggest that T_f is a characteristic temperature indicating the formation of macro-domains with appreciable sizes.

Keywords:

• Ferroelectric
• PLZT
• macro-micro domain transition