Depolarization temperature and piezoelectric properties of Na1/2Bi1/2TiO3a€“Na1/2Bi1/2(Zn1/3Nb2/3)O3 ceramics by two-stage calcination method

摘要

A new group of NBT-based lead-free piezoelectric ceramics, Na_1/2Bi_1/2TiO₃a€“Na_1/2Bi_1/2(Zn_1/3Nb_2/3)O₃, was synthesized using the two-stage calcination method and depolarization temperatures and piezoelectric properties were also investigated. The XRD analysis showed that the ceramics system had a morphotropic phase boundary (MPB) between the rhombohedral and the tetragonal structure. The highest piezoelectric properties of e?‘‘₃₃ = 97 pC/N and e?‘?_e?‘? = 0.46 were obtained near MPB compositions. Furthermore, the depolarization temperatures near MPB compositions were slightly decreased and the lowest e?‘?_d was maintained at 210?°C.