Structure, electrical properties and temperature stability of PIN–PZN–PT piezoelectric ceramics with morphotropic phase boundary compositions

Abstract

A series of Pb(In1∕2Nb1∕2)O3–Pb(Zn1∕3Nb2∕3)O3–PbTiO3 (PIN–PZN–PT) ternary piezoelectric ceramics with compositions at the morphotropic phase boundary (MPB) were prepared. The phase structure, microstructure, electrical properties and temperature stability of PIN–PZN–PT ceramics were investigated systematically. The structural analysis indicated that an MPB phase consisting of rhombohedral and tetragonal phases was formed in all ceramics. For the selected compositions, dielectric measurements demonstrated that the Curie temperature TC changed from 237∘C to 295∘C and showed a strong trend of compositional dependence. All the samples showed good piezoelectic properties. Particularly, the 0.35PIN–0.40PZN–0.25PT sample has the optimum piezoelectric properties, the piezoelectric coefficient d33 is 589 pC/N, the electromechanical coupling factors kp and kt are 59% and 49%, respectively. Compared with PZN–PT and PMN–PT ferroelectric crystals, the superior limit of usage temperature of PIN–PZN–PT ceramics was achieved around 230∘C by thermal depoling method. These results make PIN–PZN–PT ceramics a promising material to meet the practical demands of higher temperature and larger electric field operating ranges.

Keywords

• PIN–PZN–PT piezoelectric ceramics
• temperature stability
• performance-composition maps