Preparation and electrical properties of the new lead-free (1 &minus; <i>x</i>)Bi_0.5Na_0.5TiO₃&ndash;<i>x</i>Ba(Ni_1/3Nb_2/3)O₃ piezoelectric ceramics

Abstract

A new lead-free piezoelectric ceramics of (1 ¹ x)Bi 0.5 Na 0.5 TiO 3 xBa(Ni 1/3 Nb 2/3 )O 3 (BNTBNN) (x = 0.00.07) have been prepared by a conventional solid reaction method. Their structures and electric properties have been investigated systematically. A pure perovskite phase can be formed in x¯0.06. By the introduction of Ba(Ni 1/3 Nb 2/3 )O 3 , the ceramics exhibit a lower coercive field E C . Composition for x = 0.02 shows optimal piezoelectric properties, with the piezoelectric coefficient d 33 = 121 pC/N. Temperature dependent P(E) loops and S(E) curves of 0.98BNT0.02BNN indicate that the phase transition from the ferroelectric to antiferroelectric takes place over a very wide temperature range from 75 to 150°C.

Growth, Properties and Applications of Bi0.5Na0.5TiO3 Ferroelectric Nanomaterials

“…By modulating pyrolyzation temperature and sintering temperature to 550 • C and 700 • C, respectively, BNT films with excellent uniformity and high densification were obtained (Figure 1d). In addition to ceramics and thin films, BNT nanostructures including nanorods, nanoballs, nanowires and nanosheets have been devised and prepared [38][39][40][41][42][43][44][45][46]. For example, Ji et al fabricated 0.78BNT-0.22ST nanofibers by electrospinning technology, and fabricated flexible piezoelectric composite membrane by embedding the 0.78BNT-0.22ST nanofibers into PVDF polymers, as shown in Figure 1e [47].…”