Phase transitions and dielectric, ferroelectric and piezoelectric properties of Bi0.5(Na0.82K0.18)0.5TiO3-doped (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 cera

摘要

This paper reports an investigation of (BaCa)(ZrTi)O (50BCZT) piezoelectric ceramics doped with Bi(NaK)TiO (18BNKT). For compositions between 1-5 wt% 18BNKT, a perovskite phase was observed in the sintered ceramics, with d values of approximately 370 pC/N measured at room temperature, which is about 80 % of that of pure 50BCZT. Also, the doped materials exhibit a remanent polarization of 2-5 μC/cm at temperatures above the Curie temperature (> 90 °C) of the pure 50BCZT composition. This research shows a promising route to improve the working temperature range whilst maintain good piezoelectric properties of the 50BCZT ceramics.