Piezoelectric and ferroelectric properties of new Pb9Ce2Ti12O36 and lead-free Ba2NdTi2Nb3O15 ceramics

Abstract

In this paper, measurements of the nonlinear ferroelectric, piezoelectric and dielectric properties of Pb9Ce2Ti12O36 (Pb9CTO) and Ba2NdTi2Nb3O15 (BNTN) ferroelectric ceramics are presented. Hysteresis P(E) loops were measured as a function of applied electric field, frequency and temperature. The coercive field (E (c)) and remnant polarization (P (r)) displayed temperature and frequency dependence. Lead-free BNTN ceramics exhibited a coercive field E (c) > 2.4 kV mm(-1) and a piezoelectric coefficient d (33) = 2 pC N-1. The hysteresis loop was pinched above 110A degrees C and a linear response was observed at 155A degrees C, typical of a paraelectric material. Pb9CTO was shown to be ferroelectric with coercive field E (c) = 1.2 kV mm(-1) and a d (33) = 65 pC N-1. The frequency dependences of the impedance of the Pb9CTO discs were analyzed.