Electrical properties of [Bi 1-z(Na 1-x-y-zK xLi y)] 0.5Ba zTio 3 multi-component lead-free piezoelectric ceramics

Abstract

A new system of BNT-based multi-component lead-free piezoelectric ceramics, [Bi 1-z(Na 1-x-y-zK xLi y)] 0.5Ba zTio 3, was prepared by conventional ceramic technique and me electrical properties of the ceramics were studied. The analysis of X-ray diffraction shows that all ceramics investigated can form a pure perovskite phase. The ceramics exhibit good piezoelectrie performances and strong ferroelectricity: piezoelectric constant d 33 = 205 pC/N, electromechanical coupling factor k P = 37.0%, remanent polarization P r = 38.5 μC/cm 2, coercive field E c = 2.80 kV/mm, and high depolarization temperature T d. It is obvious that [Bi 1-z(Na 1-x-y-zK xLi y)] 0.5Ba zTio 3 ceramics can be used in practical devices. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.