Depolarization temperature and piezoelectric properties of Na 1/2Bi1/2TiO3-Na1/2Bi 1/2(Zn1/3Nb2/3)O3 ceramics by two-stage calcination method

Abstract

A new group of NBT-based lead-free piezoelectric ceramics, Na 1/2Bi1/2TiO3-Na1/2Bi 1/2(Zn1/3Nb2/3)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 d33 = 97 pC/N and kt = 0.46 were obtained near MPB compositions. Furthermore, the depolarization temperatures near MPB compositions were slightly decreased and the lowest Td was maintained at 210°C. © Indian Academy of Sciences.